Question: 4. Use cs=read.table(Concr.Strength.1s.Data.txt, header=T) to read into the R object cs data on 28- day compressive-strength measurements of concrete cylinders using water/cement ratio 0.4 (see

4. Use cs=read.table(”Concr.Strength.1s.Data.txt”, header=T) to read into the R object cs data on 28-

day compressive-strength measurements of concrete cylinders using water/cement ratio 0.4 (see footnote 5 in Exercise 1 in Section 1.5). Then use the commands attach(cs); sum(Str <= 44)/length(Str); sum(Str

>= 47)/length(Str) to obtain the proportion of measurements that are less than or equal to 44, and greater than or equal to 47. What do these sample proportions estimate?

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