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A researcher has a random sample of 100 observations on variable z which is distributed normally with a mean of 15 and variance of 9.

A researcher has a random sample of 100 observations on variable z which is distributed normally with a mean of 15 and variance of 9. The sample average (zbar) is 16 and the sample variance is 8.What is the mean and variance of the sampling distribution of zbar?

The mean is 16 and its variance is 0.08

The mean is 16 and its variance is 8

The mean is 15 and its variance is 0.09

The mean is 15 and its variance is 9

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