A Researcher Selects a Sample of 36 Students from a School

question 51

Multiple Choice

A researcher selects a sample of 36 students from a school population with a mean IQ of 100 and 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.

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Definitions:

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The maximum period for which a prediction or forecast is considered valid or reliable, beyond which the uncertainty becomes too large.

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