The test statistic of $z=2.28$ is obtained when testing the claim that $p> 0.19$. This is a right-tailed test. Using a 0.10 significance level, complete parts (a) and (b).
Click here to view the standard normal distribution table for negative z scores.
Click here to view the standard normal distribution table for positive $z$ scores.
a. Find the critical value(s).
Select the correct choice below and fill in the answer box(es) within your choice.
(Round to two decimal places as needed.)
A. There is one critical value; The critical value is $\square$.
B. There are two critical values; the lower critical value is $\square$ and the upper critical value is $\square$.
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Therefore, there is one critical value; The critical value is \(\boxed{1.28}\).
Step 1 ：The problem is asking for the critical value(s) for a right-tailed test with a significance level of 0.10. Since it's a right-tailed test, there will be only one critical value. The critical value is the z-score that corresponds to the given significance level. We can find this value from the z-table or calculate it.
Step 2 ：The critical value is calculated to be approximately 1.2815515655446004.
Step 3 ：Therefore, there is one critical value; The critical value is \(\boxed{1.28}\).
