A researcher wants to know if the mean hours of television w

A researcher wants to know if the mean hours of television watched per month is different between adults and children. The researcher does not know what the standard deviation for either population is. What are the appropriate hypotheses?

Null Hypothesis: ?1 - ?2 = 0 Alt Hypothesis: ?1 - ?2 ? 0

Null Hypothesis: ?1 - ?2 = 0 Alt Hypothesis: ?1 - ?2 > 0

Null Hypothesis: ?1 - ?2 = 0 Alt Hypothesis: ?1 - ?2 < 0

Null Hypothesis: ?d = 0 Alt Hypothesis: ?d > 0

Solution

Null Hypothesis ,Hours of watched is same between adults and children Ho: u1 = u2
Alternate Hypothesis ,Hours of watched is different between adults and children H1: u1 != u2

A.   
Null Hypothesis: ?1 - ?2 = 0 Alt Hypothesis: u1 - u2 = 0