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

تمرين 10

Score-It, Inc. is a large manufacturer of video games for game systems. The marketing research department is designing a survey to determine attitudes toward the products. Additionally, the percentage of households: owning game systems and the average usage rate per week are to be determined. The department wants to be 95% confident of the results and does not want the error to exceed +/-3 percentage points for video game ownership and +/-1 hour for average usage rate. Previous reports indicate that about 70% of the households own game systems, and the average usage rate is 20 hours with a standard deviation of 10 hours.
a. What sample size would you recommend, assuming only the percentage of households owning video games is to be determined Show all your calculations.
b. What sample size would you recommend, assuming only the average usage rate per week is to be determined Show all your calculations.
c. What sample size would you recommend, assuming both the above variables are to be determined Why