Questions from Business Statistics

Q: For each of the following, tell whether it is likely to

For each of the following, tell whether it is likely to be stationary or non stationary and why. a. The price per share of Google stock, recorded daily. b. The prime rate, recorded weekly. This is the...

Q: Table 14.4.7 shows basic computer results from a

Table 14.4.7 shows basic computer results from a Box Jenkins analysis of the daily percentage changes in the Dow Jones Industrial stock market index from Jul. 31 to Oct. 9, 1987, prior to the crash of...

Q: Gross Domestic Product (GDP) is an important measure of total

Gross Domestic Product (GDP) is an important measure of total production and is used by business to help guide their planning for the future. Table 14.4.8 shows a Box Jenkins analysis of the percentag...

Q: Tables 14.4.9 and 14.4.10

Tables 14.4.9 and 14.4.10 show basic computer results from a Box-Jenkins analysis of yields on 3-month U.S. Treasury bills each year from 1970 through 2009. a. What kind of process has been fitted? b....

Q: The number of job openings fluctuates through time, providing useful information

The number of job openings fluctuates through time, providing useful information about the current state of the economy and possibilities for the future. Table 14.4.11 shows the computer results of a...

Q: At a meeting, everyone seems to be pleased by the fact

At a meeting, everyone seems to be pleased by the fact that sales increased from $21,791,000 to $22,675,000 from the third to the fourth quarter. Given that the seasonal indices are 1.061 for quarter...

Q: Consider the Walt Disney Company’s quarterly revenues as shown in Table 14

Consider the Walt Disney Company’s quarterly revenues as shown in Table 14.4.1. a. Draw a time-series plot for this data set. Describe any trend and seasonal behavior that you see. b...

Q: Consider Intel’s Net Revenue in Table 14.4.2.

Consider Intel’s Net Revenue in Table 14.4.2. a. Construct a time-series plot for this data set. Describe the seasonal and cyclic behavior that you see, as well as any evidence of ir...

Q: Does the amount of purifier have a significant effect on yield,

Does the amount of purifier have a significant effect on yield, according to this regression analysis? Based on this alone, would you be likely to recommend including a purifying step in the productio...

Q: Table 14.4.3 shows the quarterly net sales of

Table 14.4.3 shows the quarterly net sales of Mattel, a major designer, manufacturer, and marketer of toys. Because of seasonal gift giving, you might expect fourth-quarter sales to be much higher, ge...