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1. Tensile strength tests were carried out on two different grades of wire rod resulting in the accompanying data:

Grade Sample Size Sample Mean Sample St. Dev.

1064 m= 130 xbar= 108 s1= 1.3

1078 n= 130 ybar= 124 s2= 2.0

a. Does the data provide compelling evidence for concluding that true average strength for the 1078 grade exceeds that for the 1064 grade by more than 10 ? Test the appropriate hypotheses using the -value approach.

b. To estimate the difference between true average strengths for the two grades in a way that provides information about precision and reliability, determine the 95% confidence interval for the difference between the two grades.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91014792

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