Stat 119 f07 final exam

# Stat 119 f07 final exam - Instructor Class Meeting Time...

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A Use the following information to answer problems 1-2 (19 points): The national average for the 7 th grade aptitude test in 2004 was 86. The principal at O’Farrell Middle School feels that the average for his students this year will be different. He randomly selected nine students to take the aptitude test. Their scores were: 83.9 73.7 82.1 88.5 87.2 83.3 85.6 79.2 80.3 1. (3 points) State the appropriate null and alternative hypotheses. 2. Conduct a test of the hypotheses identified above. I. (6 points) Calculate the test statistic Answer: II. (4 points) Calculate the corresponding p-value. Answer: III. (3 points) Make a statistical decision using level of significance of 0.01. Justify your decision. IV. (3 points) Interpret your decision in the context of the problem. Total: ________(19) 2

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A Use the following information to answer problems 8-9 (9 points): A study of unexcused absenteeism among factory workers looked at a year’s records for 65 workers in an English factory and found the mean number of days absent was 9.88. Regard these
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Stat 119 f07 final exam - Instructor Class Meeting Time...

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