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 75 points, with a standard deviation of 15 points. Determine and interpret a 90% confidence interval for the mean test score of all the company's warehouse employees. (Please keep at least four decimal places). The correct test statistic for the above question is: 1.669 1.282 1.998 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 employees, the mean test score was 75 points, with a standard deviation of 15 points. Determine and interpret a 90% confidence interval for that mean test score of all the company's warehouse employees. (Please keep at least four decimal places). Which conclusion would you draw for the above question?

Explanation / Answer

sample mean = 75

std. dev. = 15

sample size n = 64

In order to determine the 90% confidence interval, we use z statistics value.

Using the z-standards table, this value is 1.645

Hence option C is correct

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