Students had an average score of 100 with a standard deviation of 15. A sample of 30 students had a mean score of 140. Calculate the z test statistics to determine whether the null hypothesis should be rejected for a two-tailed test with an alpha level of .05. State the null and alternative hypotheses. What is the obtained z score and the critical z score. Should the null hypothesis be rejected?
What will be an ideal response?
H0: ? =100; H1: ?100
zobtained = 14.60; zcritical = 1.96
Reject the null because 14.60 is greater than the critical value of 1.96.
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