62. Chg (82017) I downloaded data on the number of citations for a random sample of 1000 journal articles published in 1981. (The data is from the ISI Citation Indexes.) I ran some analysis on the data in R, and produced the following output: > citations = scan(\"citations.txt") Read 1000 items > summary(citations) Min. 1st Qu. Median Mean 3rd Qu. Max. 0.00 0.00 1.00 9.06 7.25 300.00 > var(citations) [1] 565.2476 > # Number of articles with no citations > sum(citations == 0) [1] 460 (a) Is the distribution of the number of citations (i) exactly normal, (ii) approximately normal, or (iii) not close to normal? How do you know? (b) Find an approximate 95% condence interval for the mean number of citations. (c) Find an approximate 95% condence interval for the proportion of journal articles with no citations