Question

Asked Oct 21, 2019

**At a .01 “alpha level”, what is the “critical cutoff” z-score for a “one-tailed test”? Explain how you figured out this z-score.**

Step 1

**Introduction:**

A one-tailed test may be of two types: left-tailed or right-tailed, depending upon whether the alternative hypothesis is of the less than-type (<) or greater-than type (>).

The *z*-test uses the standard normal distribution to find its cut-off values.

For a left-tailed *z*-test, the cut-off at *α* value (significance level) 0.01 is the value of the standard normal variable, *Z*, such that *P* (*Z* > *z*) = 0.01. This particular value is denoted by *zα* = *z*0.01, so that, *P* (*Z* > *z*0.01) = 0.01.

For a right-tail...

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