1-9 questions asked A researcher theorizes that first-born children of African-A

Question

1-9 questions asked 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?

What would be the alternative hypothesis of this study?

A. Ha: Mean= 50

B. Ha: Mean = 105

C. Ha: Mean > 100

D. Ha: Mean > 105

E. None of the above

Explanation / Answer

Here population of interest is intelligence of first-born children of African-American families

Here claim is that first-born children of African-American families are more intelligent than other African-American children.

Which means claim is that mean>100 (as 100 is average of other African-American children)

So answer is

C. Ha: Mean > 100

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