What is a subtype discriminator? Given an example of its use.
> In a normal respiratory cycle the volume of air that moves into and out of the lungs is about 500 mL. The reserve and residue volumes of air that remain in the lungs occupy about 2000 mL and a single respiratory cycle for an average human takes about 4 s
> Some of the highest tides in the world occur in the Bay of Fundy on the Atlantic Coast of Canada. At Hopewell Cape the water depth at low tide is about 2.0 m and at high tide it is about 12.0 m. The natural period of oscillation is about 12 hours and on
> A variable star is one whose brightness alternately increases and decreases. For the most visible variable star, Delta Cephei, the time between periods of maximum brightness is 5.4 days, the average brightness (or magnitude) of the star is 4.0, and its b
> The city of New Orleans is located at latitude 30°N. Use Figure 9 to find a function that models the number of hours of daylight at New Orleans as a function of the time of year. To check the accuracy of your model, use the fact that on March
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y =| cosπ x|
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y =|√x - 1|
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = ¼ tan (x – π/4)
> You put some ice cubes in a glass, fill the glass with cold water, and then let the glass sit on a table. Describe how the temperature of the water changes as time passes. Then sketch a rough graph of the temperature of the water as a function of the ela
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = |x - 2|
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y =|x|- 2
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = sin(1/2x)
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = 3 - 2 cos x
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = 2 - √x
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = 1 + sinπ x
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = x2 - 4x + 5
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = 2 x + 1
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = 2 cos 3x
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = 1 – 1/x
> Trees grow faster and form wider rings in warm years and grow more slowly and form narrower rings in cooler years. The figure shows ring widths of a Siberian pine from 1500 to 2000. a. What is the range of the ring width function? b. What does the grap
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = x3 + 1
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = (x - 3)2
> Graph the function by hand, not by plotting points, but by starting with the graph of one of the standard functions given in Section 1.2, and then applying the appropriate transformations. y = -x2
> a. How is the graph of y = 2sinx related to the graph of y = sinx? Use your answer and Figure 6 to sketch the graph of y = 2sinx. b. How is the graph of y = 1 + √x related to the graph of y = √x ? Use your answer and
> The graph of y = 3x − x2 is given. Use transformations to create a function whose graph is as shown. yA 1.5- y=V3x– x² 3 yA -4 -1 0 --2.5
> The graph of y = 3x − x2 is given. Use transformations to create a function whose graph is as shown. yA 1.5- y=V3x– x² 3 y. 3- 5 х 2.
> The graph off is given. Use it to graph the following functions. a. y = f(2x) b. y = f(1/2x) c. y = f(-x) d. y = 2f(-x) yA 1 이 1
> Match each equation with its graph. Explain your choices. (Don’t use a computer or graphing calculator.) a.y=3x b. y = 3x c. y = x3 d. y = 3
> Match each equation with its graph. Explain your choices. (Don’t use a computer or graphing calculator.) a. y = x2 b. y = x5 c. y = x8 4.
> Classify each function as a power function, root function, polynomial (state its degree), rational function, algebraic function, trigonometric function, exponential function, or logarithmic function. a. y = πx b. y = x π c. y = x2(2 - x3) d. y = tan t
> Shown is a graph of the global average temperature T during the 20th century. Estimate the following. a. The global average temperature in 1950 b. The year when the average temperature was 14.2°C c. The year when the temperature was smalles
> Classify each function as a power function, root function, polynomial (state its degree), rational function, algebraic function, trigonometric function, exponential function, or logarithmic function. a. f(x) = log2 x b. g(x) = 4
> The table shows the mean (average) distances d of the planets from the sun (taking the unit of measurement to be the distance from the earth to the sun) and their periods T (time of revolution in years). a. Fit a power model to the data. b. Kepler&acir
> The table shows the number N of species of reptiles and amphibians inhabiting Caribbean islands and the area A of the island in square miles. a. Use a power function to model N as a function of A. b. The Caribbean island of Dominica has area 291 mi2. H
> It makes sense that the larger the area of a region, the larger the number of species that inhabit the region. Many ecologists have modeled the species-area relation with a power function and, in particular, the number of species S of bats living in cave
> Many physical quantities are connected by inverse square laws, that is, by power functions of the form f(x) = kx-2. In particular, the illumination of an object by a light source is inversely proportional to the square of the distance from the source. Su
> The table shows average US retail residential prices of electricity from 2000 to 2012, measured in cents per kilowatt hour. a. Make a scatter plot. Is a linear model appropriate? b. Find and graph the regression line. c. Use your linear model from par
> The table shows world average daily oil consumption from 1985 to 2010 measured in thousands of barrels per day. a. Make a scatter plot and decide whether a linear model is appropriate. b. Find and graph the regression line. c. Use the linear model to
> When laboratory rats are exposed to asbestos fibers, some of them develop lung tumors. The table lists the results of several experiments by different scientists. a. Find the regression line for the data. b. Make a scatter plot and graph the regression
> Anthropologists use a linear model that relates human femur (thighbone) length to height. The model allows an anthropologist to determine the height of an individual when only a partial skeleton (including the femur) is found. Here we find the model by a
> Biologists have observed that the chirping rate of crickets of a certain species appears to be related to temperature. The table shows the chirping rates for various temperatures. a. Make a scatter plot of the data. b. Find and graph the regression lin
> Determine whether the curve is the graph of a function of x. If it is, state the domain and range of the function. 이 1
> If f(x) = x + 2−
> What three data anomalies are likely to be the result of data redundancy? How can such anomalies be eliminated?
> What is normalization?
> Is it possible for a book to appear in the BOOK table without appearing in the PRODUCT table? Why or why not?
> According to the data model, is it required that every entity instance in the PRODUCT table be associated with an entity instance in the CD table? Why or why not?
> List all of the attributes of a movie.
> What is the difference between partial completeness and total completeness?
> What is an overlapping subtype? Give an example.
> What is a specialization hierarchy?
> What kinds of data would you store in an entity subtype?
> Why may the client/server evolution be characterized as a bottom-up change and how does this change affect the computing environment?
> What is the most common design trap, and how does it occur?
> Using an ER diagram, illustrate how the change you made in problem 1 affects the relationship of the USER entity to the following entities: LAB_USE_LOG RESERVATION CHECK_OUT WITHDRAW
> Verify the conceptual model you created in Appendix B, problem 3. Create a data dictionary for the verified model.
> Tiny College wants to keep track of the history of all administrative appointments (date of appointment and date of termination). (Hint: Time variant data are at work.) The Tiny College chancellor may want to know how many deans worked in the College of
> Research – and document -- the purchase of a new house. Requirements: a. What web sites did you visit? b. Classify each site (B2B, B2C, and so on.) c. What information did you collect? Was the information useful? Why or why not? d. What decision(s) did y
> Research – and document -- the purchase of a new car. Based on your research, explain why you plan to buy this car. Requirements: a. What web sites did you visit? b. Classify each site (B2B, B2C, and so on.) c. What information did you collect? Was the i
> Use the Internet at your university computer lab or home to research the scenarios described in Problems 1-10. Then work through the following problems: a. What web sites did you visit? b. Classify each site (B2B, B2C, and so on.) c. What information did
> Using the contracting company’s ERD in Chapter 6, “Normalization of Database Tables,” Figure 6.15, create the equivalent OO representation.
> Using the ERD shown in Appendix C, “The University Lab Conceptual Design Verification, Logical Design, and Implementation,” Figure C.22 (the Check_Out component), create the equivalent OO representation.
> Convert the following relational database tables to the equivalent OO conceptual representation. Explain each of your conversions with the help of a diagram. ) Note: The Avion Sales database includes the tables shown in Figure PG.7). FIGURE PG.7 TheAvio
> Why may client/server computing be considered an evolutionary, rather than a revolutionary, change?
> Convert the following relational database tables to the equivalent OO conceptual representation. Explain each of your conversions with the help of a diagram. (Note: The R&C Stores database includes the three tables shown in Figure PG.6) FIGURE PG.6
> Assume the following business rules: • A course contains many Sections, but each Section references only one course. • A Section is taught by one professor, but each professor may teach one or more different Sections of one or more courses. • A Section m
> Given the information in Problem 1, define a superclass VEHICLE for the TRUCK class. Redraw the object space you developed in Problem 3, taking into consideration the new superclass that you just added to the class hierarchy.
> Using the data presented in Problem 1, develop an object space diagram representing the object's state for the instances of TRUCK listed below. Label each component clearly with proper OIDs and attribute names. a. The instance of the class TRUCK with TRU
> Using the tables in Figure PG.1 as a source of information: a. Define the implied business rules for the relationships. b. Using your best judgment, choose the type of participation of the entities in the relationship (mandatory or optional). Explain you
> Convert the following relational database tables to the equivalent OO conceptual representation. Explain each of your conversions with the help of a diagram. (Note: The RRE Trucking Company database includes the three tables shown in Figure PG.1).
> Using the information given in the physical design section (C.5), estimate the space requirements for the following entities: RESERVATION INV_TRANS TR_ITEM LOG ITEM INV_TYPE (Hint: You may want to check Appendix B's Table B.3, A Sample Volume of Informat
> Design and verify a database application for one of your local not-for-profit organizations (for example, the Red Cross, the Salvation Army, your church, mosque, or synagogue). Create a data dictionary for the verified design.
> Design (through the logical phase) a student advising system that will enable an advisor to bring up the student's complete performance record at the university. A sample output screen should look like the one shown in Table PC.6. Table PC.6 The Student
> Verify the conceptual model you created in Appendix B, Problem 7. Create a data dictionary for the verified model.
> What are some of the managerial and technical issues encountered in the implementation of client/server systems?
> Verify the conceptual model you created in Appendix B, Problem 6. Create a data dictionary for the verified model.
> Verify the conceptual model you created in Appendix B, Problem 5. Create a data dictionary for the verified model.
> Verify the conceptual model you created in Appendix B, Problem 4. Create a data dictionary for the verified model.
> You have just been employed by the ROBCOR Trucking Company to develop a database. To gain a sense of the database’s intended functions, you have spent some time talking to ROBCOR’s employees and you’ve examined some of the forms used to track driver assi
> Use the following brief description of operations as the source for the next database design: All aircraft owned by ROBCOR require periodic maintenance. When maintenance is required, a maintenance log form is used to enter the aircraft identification num
> Create an ER diagram for a hardware store. Make sure that you cover (at least) store transactions, inventory, and personnel. Base your ER diagram on an appropriate set of business rules that you develop. (Note: It would be useful to visit a hardware sto
> Suppose a manufacturer produces three high cost, low volume products: P1, P2, and P3. Product P1 is assembled with components C1 and C2; product P2 is assembled with components C1, C3, and C4; and product P3 is assembled with components C2 and C3. Compon
> Create the initial ER diagram for a video rental shop. Use (at least) the following description of operations on which to base your business rules. The video rental shop classifies movie titles according to their type: Comedy, Western, Classical, Science
> Create the initial ER diagram for a car dealership. The dealership sells both new and used cars, and it operates a service facility. Base your design on the following business rules: a. A salesperson can sell many cars but each car is sold by only one sa
> Suppose that you have been given the table structure and data shown in Table 6.9, which was imported from an Excel spreadsheet. The data reflect that a professor can have multiple advisees, can serve on multiple committees, and can edit more than one jou
> What are the logical components of a client/server application and how are these components allocated in a client/server environment?
> Use the dependency diagram shown in Figure 6.8 to work the following problems. FIGURE P6.8 Initial Dependency Diagram for Problem 8 a. Break up the dependency diagram in Figure 6.8 to create two new dependency diagrams, one in 3NF and one in 2NF. b.
> Suppose you are given the following business rules to form the basis for a database design. The database must enable the manager of a company dinner club to mail invitations to the club’s members, to plan the meals, to keep track of who attends the dinne
> The table structure shown in Table P6.6 contains many unsatisfactory components and characteristics. For example, there are several multivalued attributes, naming conventions are violated, and some attributes are not atomic. Table P6.6 Sample EMPLOYEE Re
> To keep track of office furniture, computers, printers, and so on, the FOUNDIT company uses the table structure shown in Table P6.5. Table P6.5 Sample ITEM Records Attribute Name Sample Value Sample Value Sample Value ITEM_ID 231134-678 342245-2
> Using the STUDENT table structure shown in Table P6.4, do the following: Table P6.4 Sample STUDENT Records Attribute Name Sample Value Sample Value Sample Value Sample Value Sample Value STU_NUM 211343 200128 199876 199876 223456 STU_LN
> Using the INVOICE table structure shown in Table P6.3, do the following: Table P6.3 Sample INVOICE Records Attribute Name Sample Value Sample Value Sample Value Sample Value Sample Value INV_NUM 211347 211347 211347 211348 211349 PROD_NU
> Using the descriptions of the attributes given in the figure, convert the ERD shown in Figure P6.2 into a dependency diagram that is in at least 3NF.
> Given the sample records in the CHARTER table shown in Table P6.11, do the following: Table P6.11 Sample CHARTER Records Attribute Name Sample Value Sample Value Sample Value Sample Value CHAR_TRIP 10232 10233 10234 10235 CHAR_DATE 15-Jan
> The manager of a consulting firm has asked you to evaluate a database that contains the table structure shown in Table P6.10. Table P6.10 Sample CLIENT Records Attribute Name Sample Value Sample value Sample Value CLIENT_NUM 298 289 289 CLI
> Using the descriptions of the attributes given in the figure, convert the ERD shown in Figure P6.1 into a dependency diagram that is in at least 3NF.
> What, if any, client/server standards exist and how do such standards affect the client/server database environment?
> The Journal of E-commerce Research Knowledge is a prestigious information systems research journal. It uses a peer-review process to select manuscripts for publication. Only about 10 percent of the manuscripts submitted to the journal are accepted for pu
> “Martial Arts R Us” (MARU) needs a database. MARU is a martial arts school with hundreds of students. It is necessary to keep track of all the different classes that are being offered, who is assigned to teach each class, and which students attend each
> The FlyRight Aircraft Maintenance (FRAM) division of the FlyRight Company (FRC) performs all maintenance for FRC’s aircraft. Produce a data model segment that reflects the following business rules: • All mechanics are FRC employees. Not all employees are
> Some Tiny College staff employees are information technology (IT) personnel. Some IT personnel provide technology support for academic programs. Some IT personnel provide technology infrastructure support. Some IT personnel provide technology support for
