The following sample of n = 7 scores was obtained from a population with unknown parameters….

The following sample of n = 7 scores was obtained from a population with unknown parameters. Scores: 2, 18, 15, 5, 15, 8, 7.

a. Compute the sample mean and variance. (Note: These are descriptive values that summarize the sample data.)

b. Compute the estimated standard error for M. (Note: This is an inferential value that describes how accurately the sample mean represents the unknown population mean.)

Explain why t distributions tend to be flatter and more spread out than the normal distribution.

Find the t values that form the boundaries of the critical region for a two-tailed test with a 5 .05 for each of the following sample sizes:

Find the t value that forms the boundary of the critical region in the right-hand tail for a two-tailed test with a  =.05 for each of the following sample sizes.

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