mm The data set lowbwt contains information for a sample of 100 lowr birth weight infants born in two teaching hospitals in Boston. Measurements of systolic blood pressure are saved under the variable name sbp and values of gestational age under the name gestage. a. Construct a twoway scatter plot of sbp vs. gestage. Does the graph suggest anything about the nature of the relationship between the variables? b. Using systolic blood pressure as the response and gestational age as the explanatory variable, compute the least-squares regression line. Interpret the estimated slope and y- intercept of the line; What do they mean in words? c. At the 0.05 level of signicance. test the null hypothesis that the true population slope [i is equal to ill. What do you conclude? d. What is the estimated mean systolic blood pressure for the population of low birth weight infants whose gestational age is 31 weeks