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# People in the aerospace industry conducted a pilot study to determine the relationship between the weight and cost of a major object being sent into...

People in the aerospace industry conducted a pilot study to determine the relationship between the weight and cost of a major object being sent into space. The results of the pilot study are contained in datafile SP13.53, contained in a folder under the CML Quizzes tab. Determine the number of observations needed to be 89% confident that the estimate of the average cost is within $15 of the overall mean cost. Note: Assume that the pilot study standard deviation is a good estimate of the population standard deviation, that an appropriate value from the Z-table can be used, and that hand calculations are used to find the answer (i.e. do not use Kaddstat). **Hint: **in Excel, use Data > Data Analysis > Descriptive Statistics, to find the sample standard deviation.