A researcher selects a sample of 36 students from a school population with a mean IQ of 100 and a standard deviation of 12. She determines that the mean IQ in this sample is 104. Assuming she computes a one-sample z test at a .05 level of significance, what is the decision for a two-tailed test?
A. Retain the null hypothesis; IQ scores in this sample are the same as those in the population.
B. Reject the null hypothesis; IQ scores in this sample are significantly higher than those in the population.
C. There is not enough information to make a decision.
Ans: B
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