Question

A large hospital wholesaler, as part of an assessment of workplace safety, gave a random sample of 54 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 sample standard deviation of 15 points. Determine and interpret a 95% confidence interval for the mean test score of all the company’s warehouse employees. (Please keep at least four decimal places). 28. To construct the 95% confidence interval, we should:

A) use z-value 2.576 from the z table, because we have the population standard deviation.

B) use z-value 1.960 from the z table, because we have the population standard deviation.

C) use t-value 2.006 from the t table, because we have the sample standard deviation.

D) use t-value 1.669 from the t table, because we have the sample standard deviation.

A large hospital wholesaler, as part of an assessment of workplace safety, gave a random sample of 54 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 sample standard deviation of 15 points. Determine and interpret a 95% confidence interval for the mean test score of all the company’s warehouse employees. (Please keep at least four decimal places).

29. The 95% confidence interval is:

A) [71.8706, 78.1294]

B) [72.0687, 77.9412]

C) [71.2537, 78.7463]

D) [70.9053, 79.0947]

A large hospital wholesaler, as part of an assessment of workplace safety, gave a random sample of 54 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 sample standard deviation of 15 points. Determine and interpret a 95% confidence interval for the mean test score of all the company’s warehouse employees. (Please keep at least four decimal places).

30. We can interpret the interval in the following manner:

A)

We are 99% confident that the population mean test score is NOT covered by the interval.

B) The length of the interval is 95% of one.

C) We are 5% confident that the population mean test score is covered by the interval.

D) We are 95% confident that the population mean test score is covered by the interval.

Answer 1

confidence interval estimation is done to estimate population mean at 95%