Consider the data from the experiment of Example 9.2-2, which compares the current flow of two micro circuit designs. Thus, the n1 = 35 measurements using Design 1 give X1 = 24.2 amps, S1 = √10 amps, and the n2 = 40 measurements using Design 2 give X2 = 23.9 amps and S2 = √14.3 amps. Is the mean current flow with Design 1 (statistically) significantly bigger than that of Design 2?

(a) Test at level α = 0.1 and compute the p-value.

(b) Use cf=read.table(”MicroCirCurFlo.txt”, header=T) to read the data into the R data frame cf, then use R commands to conduct the test of part

(a) and to construct a 90% CI.