Basic Marketing Research 7th Edition by Gilbert Churchill,Tom Brown,Tracy Suter

تمرين 7

Compute the 95% confidence interval for the percentage of automobiles with more than $250 worth of electronics in them using the information in the previous question.
(Reference Question 1)
A large manufacturer of electronic components for automobiles once conducted a study to determine the average value of electronic components per automobile. Personal interviews were conducted with a random sample of 400 respondents. The following information was secured with respect to each subject's "main" vehicle when he or she had more than one.

a. Convert the above information into percentages.
b. Compute the cumulative percentages. c. Prepare a histogram with the average value of electronic equipment on the x-axis and the absolute frequency on they-axis.