If the test statistic is 214 for a twosided ztest for the di

If the test statistic is 2.14 for a two-sided z-test for the difference in two means for which n₁ = 13 and n₂ = 17, which of the following correctly characterizes the p-value?

Solution

P-values are probabilities. Very high or a very low z-scores, associated with very small p-values, are found in the tails of the normal distribution.

A key idea here is that the values in the middle of the normal distribution , represent the expected outcome. When the absolute value of the Z score is large and the probabilities are small, you are seeing something unusual and generally very interesting.