A recent GSS reported that the 486 surveyed females had a mean of 8.3 close friends (s

Question:

A recent GSS reported that the 486 surveyed females had a mean of 8.3 close friends (s = 15.6) and the 354 surveyed males had a mean of 8.9 close friends (s = 15.5).
a. Estimate the difference between the population means for males and females.
b. The 95% confidence interval for the difference between the population means is 0.6 { 2.1.
Interpret.
c. For each gender, does it seem like the of number of close friends is normal? Why? How does this affect the validity of the confidence interval in part b?
Distribution
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