Question

Eight male and eight female college students who have credit cards were surveyed and asked their total credit card debt. The responses are given below in dollars:

Males	1000	2100	900	1200	1300	500	1400	700
Females	1300	500	2000	1800	1300	1000	2600	1400

1. Is this an observational study or a designed experiment? Explain your answer.

2. Is it reasonable to use Welch’s t-test? Explain your answer.

3. Is there a difference in the mean credit card debt of males and females? Use α = 0.10. List out all 5 steps in the hypothesis testing and show your work.

Step 1

Step 2

Step 3

Step 4

Step 5

4. Construct a 90% confidence interval for the difference in the mean credit card debt of male and female college students.

Lower Bound:    

Upper Bound:  

Answer 1