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Unformatted text preview: 7.  Calculate the 99% confidence interval for the population mean using the following sample: x 4 9 1 6 2 1 8 1 8.  The proportion of students who travel during spring break is .4. What is the probability of less than 75 travels in a sample of 200 students? 9  A sample of 81 students contains 33 who enroll in classes during the summer. Calculate the 99% confidence interval for the population of students who take classes during the summer. 11.  A sample of 120 students has an average time to commute of 28 minutes and a standard deviation of 4 minutes. Test the null hypothesis that the mean is less than or equal to 25 minutes. Use a 5% significance level. 12  Test the null hypothesis that the population mean=300 [the alternative is the mean does not equal 300]. Use a 1% significance level. A sample of 25 has a mean=290 and a standard deviation=7....
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