MATH 408 Midterm: MATH 408 USC M1 408 S16
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Instructor s. lototsky (kap 248d; x0 2389; lototsky@usc. edu) Points might be taken o for a correct answer with no explanations. Wrong answer with no explanations is worth zero points. Given the set of numbers 39, 54, 61, 72, 59, and assuming that this is a sample from a normal population, construct the 90% con dence interval for the standard deviation. Given a normal population normal with mean 1 and unknown standard deviation. A study reports that freshmen at public universities work 10. 2 hours a week for pay, on average, and the sn is 8. 5 hours; at private universities, the average is 8. 1 hours and the sn is 6. 9 hours. Assume these data are based on two independent simple random samples, each of size. Explain your conclusion by stating the corresponding null and alternative hypotheses and computing the p-value. For the rst-year students at a certain university, the correlation between sat scores and rst-year gpa was 0. 65.
