2. The data lowbwt.csv contain info m1ation for the sample 10D low birth weight infants born 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 two-way scatter plot of systolic blood pressure versus gestational age. Does the graph suggest anything about the nature of the relationship between these variables? {bl 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 yintercept of the line; what do they mean in words? {cl At the 0.05 level of signicance, test the null hypothesis that the true population slope B is equal to I]. 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