Questions from Applied Statistics

Q: Find the standard normal area for each of the following, showing

Find the standard normal area for each of the following, showing your reasoning clearly and indicating which table you used. a. P(0 < Z < 0.50) b. P(-0.50 < Z < 0) c. P(Z > 0) d. P(Z = 0)

Q: The table below shows average daily sales of Rice Krispies in the

The table below shows average daily sales of Rice Krispies in the month of June in 74 Noodles & Company restaurants. (a) Make a histogram for the data. (b) Would you say the distribution is skewed...

Q: Analysis of portfolio returns over a 20-year period showed the

Analysis of portfolio returns over a 20-year period showed the statistics below. (a) Calculate and compare the coefficients of variation. (b) Why would we use a coefficient of variation? Why not just...

Q: Analysis of annualized returns over a 10-year period showed that

Analysis of annualized returns over a 10-year period showed that prepaid tuition plans had a mean return of 6.3 percent with a standard deviation of 2.7 percent, while the Standard & Poor’s 500 stock...

Q: Caffeine content in a 5-ounce cup of brewed coffee ranges

Caffeine content in a 5-ounce cup of brewed coffee ranges from 60 to 180 mg, depending on brew time, coffee bean type, and grind. (a) Use the midrange as a measure of center. (b) Use the Empirical Rul...

Q: Chlorine is added to city water to kill bacteria. In a

Chlorine is added to city water to kill bacteria. In a certain year, chlorine content in water from the Lake Huron Water Treatment plant ranged from 0.79 ppm (parts per million) to 0.92 ppm. (a) Use t...

Q: Below are monthly rents paid by 30 students who live off campus

Below are monthly rents paid by 30 students who live off campus. (a) Find the mean, median, and mode. (b) Do the measures of central tendency agree? Explain. (c) Calculate the standard deviation. (d)...

Q: How many days in advance do travelers purchase their airline tickets?

How many days in advance do travelers purchase their airline tickets? Below are data showing the advance days for a sample of 28 passengers on United Airlines Flight 815 from Chicago to Los Angeles. (...

Q: The durations (minutes) of 26 electric power outages in the

The durations (minutes) of 26 electric power outages in the community of Sonando Heights over the past five years are shown below. (a) Find the mean, median, and mode. (b) Are the mean and median abou...

Q: The U.S. Postal Service will ship a Priority Mail

The U.S. Postal Service will ship a Priority Mail® Large Flat Rate Box (120 3 120 3 51⁄20) anywhere in the United States for a fixed price, regardless of weight. The weigh...