1. Under what circumstances is a t statistic used instead of a z-score for a hypothesis test? 2. A sample of n = 16 scores has a mean of M = 56 and a standard deviation of s = 20. a. Explain what is...

1. Under what circumstances is a t statistic used instead of a z-score for a hypothesis test?

2. A sample of n = 16 scores has a mean of M = 56 and a standard deviation of s = 20.

a. Explain what is measured by the sample standard deviation.

b. Compute the estimated standard error for the sample mean and explain what is measured by the standard error.