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Midterm 3 (Spring 2006)

Midterm 3 (Spring 2006) - students who are sophomores is.1...

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Statistics Test 3 Prof. VanderHoff SPRING 2006 All work must be shown on exam to receive credit. 1. [15] Test the hypothesis the means of groups 1, 2 and 3 are equal. Use .05 significance level. group 1 2 3 mean 95 75 70 variance 190 140 120 n 20 20 20 2 [15] Test the hypothesis that the proportion of democrats who believe in global warming is the same as the proportion of republicans who believe in global warming. Use .05 significance level, a two tail test and the following data: 2 prop dems rep Number surveyed 200 150 Believe in warming 150 95 3. [15] Test the hypothesis that the mean equals 3. Use .05 significance level, a two tail test and the following data: 5 2 6 3 9

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4 [10] Test the hypothesis that the proportion of students who like stats=.65. Use .05 significance level. A survey of 50 students included 38 students who like statistics. 5. [20] Test the hypothesis that the proportions of students who are freshmen is .2, the proportions of
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Unformatted text preview: students who are sophomores is .1, the proportions of students who are juniors is .3 and the proportions of students who are seniors is .4. [pfresh=.2; psoph=.1 pjr=.3; psr=.4]. Use .05 significance level and the following data on enrollments: group number fresh 15 soph 15 jr 25 sr 45 6 [10] Test the null hypothesis that the mean time to find parking is equal to 15 minutes. A sample of 60 students had a mean time of 13.5 minutes and a standard deviation of 4 minutes. . Use .05 significance level and a two tail test. 7 [15] Test the null hypothesis that the mean for ru-n students is less than or equal to the mean for ru-nb. Use .05 significance level, a one tail test and the following data: Ru-n Ru-nb Mean 45 42 Variance 25 20 number 60 50...
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