215 SPSS#3, Summer 2011 - PASW/SPSS Homework #3: T tests...

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PASW/SPSS Homework #3: T tests and C.I. (70 points) STA 215: Introductory Applied Statistics Summer, 2011 Name Edit and turn in your PASW/SPSS outputs. 1. Here are second test scores of a STA215 class. Assume that these students is a random sample of all students who are taking STA215 this semester (about 1,400 students). If all students took the same test, do you think the average score will be different from μ =70? Use α =0.10 to do this hypothesis testing. 83 48 78 86 79 92 84 55 90 90 82 73 73 90 58 74 54 37 100 51 77 89 73 80 56 61 82 51 81 a) State the null and alternative hypotheses. (4 points) b) What is the test statistic value and the P-value? (4 points) c) What is your decision? Why? (3 points) d) What is your conclusion? (3 points) e) What is the 90% confidence interval? (2 points) f) Turn in PASW/SPSS output. (6 points) 2. A class of STA 215 students took two exams. Assume that these students is a random sample of all students who are taking STA215 this semester (about 1,500 students). If
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215 SPSS#3, Summer 2011 - PASW/SPSS Homework #3: T tests...

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