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Meal costs. A company is interested in estimating the costs of lunch in their cafeteria. After surveying employees, the staff calculated that a 95% confidence interval for the mean amount of money spent for lunch over a period of six months is ($780, $920). Now the organization is trying to write its report and considering the following interpreta- tions. Comment on each.
a) 95% of all employees pay between $780 and $920 for lunch.
b) 95% of the sampled employees paid between $780 and $920 for lunch.
c) We're 95% sure that employees in this sample averaged between $780 and $920 for lunch.
d) 95% of all samples of employees will have average lunch costs between $780 and $920.
e) We're 95% sure that the average amount all employees pay for lunch is between $780 and $920.
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Using an appropriate probability model for the population from which the data is a random sample, obtain a precise 95% con?dence interval for the mean of this population; use this interval estimate to test the hypothesis by the Editor-in-Chief that..
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