A researcher theorizes that first-born children of African-American families are

Question

A researcher theorizes that first-born children of African-American families are more intelligent than other African-American children. A sample of 50 first-born children of African-American families is found to have an average IQ of 105, while based on other studies we can assume that IQ of other African-American children is 100 on average and has standard deviation of 15. What is the population of interest in this study?

Which method researcher can use to check her idea? A. Hypothesis testing - Z test B. Hypothesis testing - t test C. Sample size estimation for average D. None of the above

Explanation / Answer

The population of interest is children of African - American families.

We should use hypothesis testing using t- distribution because the population variances are unknown.

Answer:B). Hypothesis testing - t test.

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