Questions from Business Statistics

Q: Your firm is having a quality problem with the production of plastic

Your firm is having a quality problem with the production of plastic automotive parts: There are too many defectives. One of your engineers thinks the reason is that the temperature of the process is...

Q: Closed-end funds sell shares in a fixed basket (portfolio

Closed-end funds sell shares in a fixed basket (portfolio) of securities (as distinguished from ordinary mutual funds, which continuously buy and sell shares of securities). Consider the net asset val...

Q: Consider the number of transactions and the total dollar value of merger

Consider the number of transactions and the total dollar value of merger and acquisition deals in the oil and gas industry, from Table 11.1.6. a. Find the regression equation for predicting the dollar...

Q: Consider the slightly scary topic of business bankruptcies. Table 11.

Consider the slightly scary topic of business bankruptcies. Table 11.3.4 shows data for each state on the number of failed businesses and the population in millions. a. Construct a scatterplot of busi...

Q: What is your best estimate, with confidence limits, for potential

What is your best estimate, with confidence limits, for potential catalog sales?

Q: Consider the daily percent changes of McDonald’s stock price and those of

Consider the daily percent changes of McDonald’s stock price and those of the Dow Jones Industrial Average for trading days in the months of Jan. and Feb. 2010, as shown in Table 11....

Q: This problem continues the analysis of McDonald’s and Dow Jones stock market

This problem continues the analysis of McDonald’s and Dow Jones stock market data. a. Find the 95% confidence interval for the percent change in McDonald’s stock on a day in which the Dow Jones Index...

Q: In the territory versus sales example (based on the data from

In the territory versus sales example (based on the data from Table 11.2.3), the least-squares line to predict sales based on the population of the territory was found to be Expected sales = $1,371,74...

Q: Using the donations database on the companion site, and using only

Using the donations database on the companion site, and using only people who made a donation in response to the current mailing, consider predicting the amount of a donation (named “Donation_D1” in t...

Q: Using the donations database on the companion site, and using only

Using the donations database on the companion site, and using only people who made a donation in response to the current mailing, consider predicting the amount of a donation (named “Donation_D1” in t...