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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  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  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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