1 answer

Having problem solving the z value, my answer that i got was -76.34 and was wrong, also need a better

Question:

Tenslle strength tests were carried out on two different grades of wire rod, resulting In the accompanylng data. Sample Mcan

Having problem solving the z value, my answer that i got was -76.34 and was wrong, also need a better understanding of b

Tenslle strength tests were carried out on two different grades of wire rod, resulting In the accompanylng data. Sample Mcan Sample Sample (kg/mm2)SU Grade AISI 1064 AISI 1078 Size m-127 n127 s1 _ 1.2 125.3 22.0 x-109.5 (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 kg/mm2 Test the appropriate hypotheses using a significance level o 0.01. State the relevant hypatheses Ho: #1064-#1078-_10 μ1064-11078 -10 Ho: H1064 H107810 ai μ1064-μ1078 2-10 Hai μ1064-#1078

Answers


Date: 15/05/2019 Answer a) The z-test statistics is By using Excel, find z-test statistics with the help of following steps iHypothesis Test: Independent Groups (z-test) AISI 1064 AISI 1078 109.5 125.3 mean 1.2 127 2std. dev. 127 n 15.8000 differenceFrom Excel output in part (a), a 95% confidence interval for the difference between true average strengths for the two grades

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