1. Nintendo Sony would like to test the hypothesis that a difference exists in t
ID: 3233098 • Letter: 1
Question
1. Nintendo Sony would like to test the hypothesis that a difference exists in the average age of users of a Wii, a PlayStation, or an Xbox console game. The following data represent the age of a random sample of Wii, PlayStation, and Xbox users.
The grand mean for these observations is ________.
a. 30 b. 31.3 c. 30.9 d. 31.8
2. Suppose Burger King has run a major advertising campaign in the hopes of increasing monthly sales. To investigate the effectiveness of this campaign, Burger King randomly selected six restaurants and recorded the monthly sales before and after the advertising. The following data represents these sales figures in thousands of dollars.
If Population 1 is defined as sales after the advertising campaign and Population 2 is defined as sales before the advertising campaign, and using = 0.05, which one of the following statements is true?
D. Because the p-value is less than , we cannot conclude that the average restaurant sales per month after the advertising campaign are higher than the average restaurant sales per month before the advertising campaign.
3. AutoTrader.com would like to test if a difference exists in the age of three different types of vehicles currently on the road--trucks, cars, and vans. The following data represent the age of a random sample of trucks, cars, and vans.
Explanation / Answer
Q1
Grand Mean = Sum of all observations/ number of observations = 450/15 = 30
Option a)
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