41. A civil engineer wishes to measure the compressive strength of two different types of concrete. A random sample of 10 specimens of the first type yielded the following data (in psi)

whereas a sample of 10 specimens of the second yielded the data

If we assume that the samples are normal with a common variance, determine

(a) a 95 percent two-sided confidence interval for μ1 − μ2, the difference in means;

(b) a 95 percent one-sided upper confidence interval for μ1 − μ2;

(c) a 95 percent one-sided lower confidence interval for μ1 − μ2.

Transcribed Image Text:

Type 1: 3,250, 3,268, 4,302, 3,184, 3,266 3,297, 3,332, 3,502, 3,064, 3,116