Please answer both questions correctlybelow asap. Thank you.

Question8.19. The file Sedans contains the overall miles per gallon (MPG) of 2013 midsized sedans:

38 26 30 26 25 27 22 27 39 24 24 26 25

23 25 26 31 26 37 22 29 25 33 21 21

a. Construct a 95% confidence interval estimate for the poulation mean MPG of 2013 family sedans, assuming a normal distribution.

b. Interpret the interval constructed in (a)

Question9.23 If, in a sample of n=160 selected from a left-skewed population,X = 65 and S =21, would you use the t test to test the null hypothesis Ho : u =60? Discuss.