A large hospital wholesaler, as part of an assessment of workplace safety, gave

Question

A large hospital wholesaler, as part of an assessment of workplace safety, gave a random sample of 64 of its warehouse employees a test (measured on a 0 to 100 point scale) on safety procedures. For that sample of employees, the mean test score was 80 points, with a standard deviation of 10 points. We will walk through several question to help us determine and interpret a 90% confidence interval for the mean test score of all the company’s warehouse employees. (Please keep at least two decimal places). What would be a correct interpretation of the confidence interval? Question 4 options: We are 90% confident that the population mean test score of all employees is between 71.87 and 78.13 days. We are 90% confident that the sample mean test score of all employees is between 71.87 and 78.13 days. We are 90% confident that the population mean test score of all employees is less than 71.87 or greater than 78.13 days. We are 90% confident that the sample mean test score of all employees is less than 71.87 or greater than 78.13 days.

Explanation / Answer

We are 90% confident that the population mean test score of all employees is between 71.87 and 78.13

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