Choose the hypotheses that can be tested using paired-samples t tests.
A) People living in warm countries are happier than people from cold countries.
B) Homicide rates, on average, are higher in Western counties than in Southern counties of the United States.
C) Graduates had higher average salaries 10 years after the graduation than they had 5 years after the graduation.
D) The length of life, on average, is shorter for never-married persons than for married persons who married at least once.

Question

Choose the hypotheses that can be tested using paired-samples t tests. ​
A) People living in warm countries are happier than people from cold countries.
B) Homicide rates, on average, are higher in Western counties than in Southern counties of the United States.
C) Graduates had higher average salaries 10 years after the graduation than they had 5 years after the graduation.
D) The length of life, on average, is shorter for never-married persons than for married persons who married at least once.

Quizplus · Accepted Answer

The hypothesis in option C involves comparing the salaries of the same group of people (graduates) at two different points in time (10 years after graduation and 5 years after graduation). This can be tested using a paired-samples t test. The other three options involve comparing two different groups of people (people from warm/cold countries, Western/Southern counties, never-married/married persons) and cannot be tested using a paired-samples t test.

Choose the Hypotheses That Can Be Tested Using Paired-Samples T