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4. Apply the steps in hypothesis testing to test the validity of the claim in the situation below. Bryan administered a mathematics achievement test to a random sample of 50 graduating pupils. In this sample, X = 90 and s = 10. The population parameters, u = 83 and o = 15. Is the performance of the sample above average? Steps Solution 1. Formulate the hypotheses: the Ho: null hypothesis and the alternative hypothesis Ha: In symbols: Ho: Ha: 2. Set the significance level of a a = 0.05 Type of test Type of test: Critical values of z Zcritical = 3. Compute the z-statistics Given: Solution: X = Z -X-H Vn n= 4. Decision: Compare the computed value of z with the critical value. 5. Conclusion Interpretation