# Hypothesis Testing - z score

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Past data indicates an 80% (0.8) success rate in treating a certain medical problem. A new treatment is used on 100 patients in a clinical trial. It is successful in 87% (0.87) of the cases. What is the value of the z-score that can be used to test the null hypothesis that the success rate is 80%?

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#### Solution Preview

Response:

Step 1: Identify the problem parameters

population mean probability of success, p = 0.8

sample mean ...

#### Solution Summary

The solution shows the value of the z-score that can be used to test the null hypothesis that the success rate is 80%.

$2.49