E Text Ch9 - E-Text Assignment 1 E-Text Assignment Chapter...

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E-Text Assignment 1 E-Text Assignment Chapter 9 E-Text Assignment Chapter 9 Neil Robinson Research and Evaluation II RES 342 University of Phoenix
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E-Text Assignment 2 9.53 On eight Friday quizzes, Bob received scores of 80, 85, 95, 92, 89, 84, 90, 92. He tells Prof. Hardtack that he is really a 90+ performer but this sample just happened to fall below his true performance level. (a) State an appropriate pair of hypotheses. (b) State the formula for the test statistic and show your decision rule using the 1 percent level of significance. (c) Carry out the test. Show your work. (d) What assumptions are required? (e) Use Excel to find the p -value and interpret it. (a) H0: µ ≥ 90 Bob’s test scores usually are 90 or above as he has claimed to Prof. Hardtack. H1: µ < 90 Bob’s test scores are usually below 90 points. (b) The best formula for the test statistic is the Student’s t , because the standard deviation is unknown and the population can be assumed to be normal. The t -test follows the 1 percent level
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E Text Ch9 - E-Text Assignment 1 E-Text Assignment Chapter...

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