Jay is testing a hypothesis regarding the effectof marital status (married and s

Question

Jay is testing a hypothesis regarding the effectof marital status (married and single) on GPA of graduate studentswho major in social science.

For a random sample of 100 married and 100 single students he findsthe following 95% CI for the difference in the GPA of married andsingle students.

minus 0.40 to plus 0.30 (-0.40 to + 0.30)

What is the best answer? Choose one answer. A. He should fail to reject thenull and conclude that marital status has no effect onGPA. B. He should reject the null andconclude that GPA is higher for married students. C. He should reject the null andconclude that the GPA for single students is +0.30 higher thanmarried ones. D. He should reject the null andconclude that GPA and marital status are related to eachother.
Can you also explain the answer? thank you! Jay is testing a hypothesis regarding the effectof marital status (married and single) on GPA of graduate studentswho major in social science.

For a random sample of 100 married and 100 single students he findsthe following 95% CI for the difference in the GPA of married andsingle students.

minus 0.40 to plus 0.30 (-0.40 to + 0.30)

What is the best answer? Choose one answer. A. He should fail to reject thenull and conclude that marital status has no effect onGPA. B. He should reject the null andconclude that GPA is higher for married students. C. He should reject the null andconclude that the GPA for single students is +0.30 higher thanmarried ones. D. He should reject the null andconclude that GPA and marital status are related to eachother. A. He should fail to reject thenull and conclude that marital status has no effect onGPA. B. He should reject the null andconclude that GPA is higher for married students. C. He should reject the null andconclude that the GPA for single students is +0.30 higher thanmarried ones. D. He should reject the null andconclude that GPA and marital status are related to eachother. A. He should fail to reject thenull and conclude that marital status has no effect onGPA. B. He should reject the null andconclude that GPA is higher for married students. C. He should reject the null andconclude that the GPA for single students is +0.30 higher thanmarried ones. D. He should reject the null andconclude that GPA and marital status are related to eachother.

Explanation / Answer

B. He should reject the null and conclude that GPA is higher formarried students. B. He should reject the null and conclude that GPA is higher formarried students. B. He should reject the null and conclude that GPA is higher formarried students.

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