A quality control specialist at a medical supply factory must estimate the mean

Question

A quality control specialist at a medical supply factory must estimate the mean quality rating of a new batch of surgical tools being produced using a sample of 18 tools. The actual distribution of this batch is unknown, but preliminary investigations show that a normal approximation is reasonable. The specialist decides to use a t-distribution rather than a z-distribution because?

The sample size is large compared to the population size

c. The variability of a batch is unknown

d. The t-distribution in a narrow confidence interval

The sample size is large compared to the population size

c. The variability of a batch is unknown

d. The t-distribution in a narrow confidence interval

Explanation / Answer

d. The t-distribution in a narrow confidence interval

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