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?

If she conducts hypothesis testing, she has to consider: A. one-tailed test B. two-tailed test C. one-tailed test because sample size is large D. two-tailed test because sample size is large

Explanation / Answer

Solution:- option A .one-tailed test.

=> If she conducts hypothesis testing, she has to consider: one-tailed test   

=> A one-tailed test is a statistical test in which the critical area of a distribution is one-sided so that it is either greater than or less than a certain value

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