Birthweights a) The vector birthweight contains the birthweights (in grams) of 188 newborn babies. Denote the underlying mean birthweight by μ. Suppose we implemented the following commands in R: > mean(birthweight) 2913.293 > var(birthweight) 486506.6 > qnorm(0.96) 1.750686 > qnorm(0.98) 2.053749 > qnorm(0.975) 1.959964 > qnorm(0.985) 2.17009 > qnorm(0.99) 2.326348 Assuming normality, construct a bounded 98% confidence interval (CI) for μ: [ Select ] [2802.05, 3024.53] [2812.94, 3013.65] [2793.93, 3032.66] [2788.40, 3038.18] . Evaluate the sample size needed to provide that the length of the 97%-CI is at most 100: [ Select ] . Would it be possible to compute a bootstrap 95%-CI for μ by using the sample birthweights? [ Select ] no yes not relevant .多重下拉选择题