Question: 3. Use cs=read.table(Concr.Strength.1s.Data.txt, header =T) to read into the R data frame cs data on 28-day compressive strength measurements of concrete cylinders using water/cement ratio

3. Use cs=read.table(”Concr.Strength.1s.Data.txt”, header

=T) to read into the R data frame cs data on 28-day compressive strength measurements of concrete cylinders using water/cement ratio 0.4,5 and the command y=cs$Str to copy the n = 32 data points into the R object y. Use R commands to complete the following parts.

(a) Construct a 95% PI for the compressive strength of the next concrete specimen.

(b) Construct a normal Q-Q plot for the data. Comment on whether or not the plot appears to contradict the normality assumption.

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