Using the z table, find the critical value (or values) for an = 0.12 right-tailed test.
For a one-tailed test, look at the column showing the smaller value to get the critical Z score.
To find the critical value for a right-tailed test using the z-table, we need to determine the corresponding z-score for the given significance level.
Step 1: Start by finding the area to the left of the test statistic.
Since we have a right-tailed test, the area to the left is equal to 1 minus the given significance level. In this case, the significance level is α = 0.12, so the area to the left is 1 - 0.12 = 0.88.
Step 2: Look up the corresponding z-score in the z-table.
The z-table provides the area under the standard normal curve to the left of a given z-score. We want to find the z-score that corresponds to an area of 0.88.
Using the z-table, we can search for the closest value to 0.88.
The closest value in the z-table is 0.8790, which corresponds to a z-score of 1.17.
Therefore, the critical value for an α = 0.12 right-tailed test is 1.17.