1. An advertisement for a word-processing class claims thatstudents who complete the class will, on average, be able to type60 words per minute (wpm) with a standard deviation of 6 wpm. Atthe end of the class, 49 students are tested and their mean scoreis 58.5 wpm.

A. Is this evidence that the true mean isdifferent from 60 wpm? Give a complete answer, using asignificance level of .05. (12 points)

B. Suppose the person conducting the research hadbelieved, before collecting data, that the graduates weren't asgood as claimed. Would this belief have changed the analysis youperformed in part (A)? (12 points)

C. Construct a 99% confidence interval for the true meanof the population. What conclusion can you draw from this interval,and do you have evidence to reject the claim that the averagegraduate can type 60 wpm? (6 points)

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Hypothesis Testing for Typing Speed Word Processing Class A Testing for Difference from Claimed Mean ... View the full answer