(2) Download from Canvas the Ritz, et al manuscript described in question {1). Focus upon the information provided in the first two rows of Table 1 at the top of page 505. Assume that gestational ages and birth weights are both normally distributed in the population with the means and standard deviations listed in Table 1. 15 SD (a) How much of the population has a gestational age of 277 days or more? The mean and the median are the same, however 50% has more than 277 days. {b) What is a reasonable range of gestational ages for 68% of the population? (262,292) {c) What is a reasonable range of gestational ages for 95% of the population? (247,307) (d) What is a reasonable range of gestational ages for 34% of the population? (262,277) and (277,292) (e) How much of the population has a gestational age of no more than 262 days? 16% {f) The fourth row of Table 1 states that 52% of the population had birth weights below 2,500g. Does this information support or refuse the assumption that birth weights are normally distributed in the population? Explain your answer. Median is: The mean is 3,376 TABLE 1. Incidence Proportion of Preterm Births by Demographic Characteristics and Air Pollution Exposure in a Cohort of 97,158 Children Delivered Vaginally between 1989 and 1993 in Southern California; Mothers Lived in the Vicinity of 17 Air-Monitoring Stations Number of Number of Births or Mean Cases or Mean Incidence + SD + SD Proportion 95% CI Mean gestational age (days) 277 + 15 Mean birth weight (gm) 244 + 14 3,376 + 504 2,931 + 664 Preterm (