The deflection temperature under load for two different types of plastic pipe is being investigated. Two random
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(a) Construct box plots and normal probability plots for the two samples. Do these plots provide support of the assumptions of normality and equal variances? Write a practical interpretation for these plots.
(b) Do the data support the claim that the deflection temperature under load for type 2 pipe exceeds that of type 1? In reaching your conclusions, use a = 0.05.
(c) Calculate a P-value for the test in part (b).
(d) Suppose that if the mean deflection temperature for type 2 pipe exceeds that of type 1 by as much as 5oF, it is important to detect this difference with probability at least 0.90. Is the choice of n1 = n2 = 15 in part (a) of this problem adequate?
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