like to set
α = 0.05. The critical value for this hypothesis test would be ________.
-1.96
±
1.645
1.645

±
1.96
Question
7
of
40
Sony would like to test the hypothesis that the average age of a PlayStation user differs from the average age of an
Xbox user. A random sample of 32 PlayStation users had an average age of 33.7 years while a random sample of 36
Xbox users had an average age of 35.6 years. Assume that the population standard deviation for the age of
PlayStation and Xbox users is 3.7 and 3.5 years, respectively. Sony would like to set
α = 0.05. The critical value for
this hypothesis test would be ________.
1.28
-1.645
±
1.96
2.33
Question
8
of
40
Sony would like to test the hypothesis that the average age of a PlayStation user differs from the average age of an
Xbox user. A random sample of 32 PlayStation users had an average age of 33.7 years while a random sample of 36
Xbox users had an average age of 35.6 years. Assume that the population standard deviation for the age of
PlayStation and Xbox users is 3.7 and 3.5 years, respectively. Sony would like to set
α = 0.05. If Population 1 is
defined as PlayStation users and Population 2 is defined as Xbox users, the test statistic for this hypothesis test
would be ________.
= 1.29
= -1.13
= 1.89
= -2.17
Question
9
of
40
The federal government would like to test the hypothesis that the average age of men filing for Social Security is
higher than the average age of women filing, using
α = 0.05 with the following data:
If Population 1 is defined as men and Population 2 is defined as women, the test statistic for this hypothesis test
would be ________.

= 1.19
= -1.78
= 2.07
= -2.23
Question
10
of
40
Two real estate companies, Century 21 and RE/MAX, compete with one another in a local market. The manager of
the Century 21 office would like to advertise that homes listed with RE/MAX average greater than 10 days more on
the market when compared to homes listed with his company. The following data show the sample size and average
number of days on the market for the two companies along with the population standard deviations.
If Population 1 is defined as RE/MAX and Population 2 is defined as Century 21, the 80% confidence interval for the
difference in population means is ________.
(17.8, 26.2)
(11.5, 32.7)
(5.4, 38.6)
(-3.0, 47.0)
Question
11
of
40
The Wall Street Journal reported that the average amount of time that a French person spends eating lunch at a
restaurant is 22 minutes. Perform a hypothesis test to determine if a difference exists between the average time an
American spends eating lunch and the average time a person from France spends eating lunch. The following data
represent the time, in minutes, that random French and American diners spent at lunch. Assume that the population
variances are equal.

If Population 1 is defined as French diners and Population 2 is defined as American diners, the 90% confidence
interval for the difference in population means is ________.

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- Fall '12
- Donnelly
- Normal Distribution, Variance, Xbox