The data set lowbwt.csvcontains information for a sample of 100 low birth weight infants born in two teaching hospitals in Boston, Massachusetts. Measurements of systolic blood pressure are saved under the variable name "sbp" and indicators of gender - with 1 representing a male and 0 a female - under the name "sex."Answer the following questions using SAS.

• a) Construct a histogram of systolic blood pressure measurements for males and another histogram for females. Based on the graphs, do you believe that blood pressure is approximately normal for male and female infants?
• b) Test the hypothesis that among low birth weight infants, the mean systolic blood pressure for male infants is equal to the mean for female infants. Use a two-sided test at the 0.05 level of significance. What do you conclude?