A test for the population mean $?$ produces a test-statistic Z = -0.75. The p-value associated with the test is 0.2266 if the test is a left-tail test, it is 0.7734 if the test is a right-tail test, and it is 0.4533 if the test is a two-tail test.

Question

Quizplus · Accepted Answer

The p-value for a left-tail test is found by looking up the Z-score in the standard normal distribution table, which gives the probability of observing a value less than Z. For Z = -0.75, this is 0.2266. For a right-tail test, the p-value is 1 minus the left-tail p-value, which is 1 - 0.2266 = 0.7734. For a two-tail test, we double the smaller of the two one-tail p-values (since Z = -0.75 is symmetrical around zero, both tails are equal), so we double 0.2266 to get 0.4533.

A Test for the Population Mean ??? Produces a Test-Statistic Z = -0

A Test for the Population Mean $?$ Produces a Test-Statistic Z = -0