# 66 degrees and the standard deviation was 624 degrees

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these 39 patients, the mean angle of deformity was 24.66 degrees and the standard deviation was 6.24 degrees. A dotplot of the data revealed no outliers or strong skewness. a. What parameter do you want to estimate, and at what confidence level? b. What inference method will you be using? Check the conditions. c. What is your 90% C.I.? d. Interpret the C.I. in the context of the problem. e. Is it plausible that the mean angle in deformity is 27 degrees? Explain. 7. Gloria Chavez and Ronald Flynn are the candidates for mayor in a large city. We want to estimate the proportion p of all registered voters in the city who plan to vote for Chavez with 94% confidence and a margin of error no greater than 0.04. a. How large a random sample do we need? Show your work. b. How large a random sample do we need, if we have prior knowledge that 42% of voters will vote for Chavez. 8. Suppose we want a 90% confidence interval for the average amount spent on books by freshmen in their first year at a major university. The interval is to have a margin of error of \$3. Based on last year’s book sales, we estimate that the standard deviation of amount spent will be close to \$29. How many observations will be required? Show your work.

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