Mathematics, 08.04.2021 23:10, kiki9555
2. (20 points) Stainless steels can be susceptible to stress corrosion cracking under certain conditions. A materials engineers is interested in determining the proportion of steel alloy failures that are due to stress corrosion cracking. (a) In the absence of preliminary data, how large a sample must be taken so as to be sure that a 98% confidence interval will specify the proportion to within ±0.05? (b) In a sample of 200 failures, 30 of them were caused by stress corrosion cracking. Find a 98% confidence interval for the proportion of failures caused by stress corrosion cracking. (c) Based on the data in part (b), estimate the sample size needed so that the 98% confidence interval will specify the proportion to within ±0.05.
Answers: 3
Mathematics, 21.06.2019 16:30, eliascampos823
Which choice represents the sample space ,s for this event
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Mathematics, 21.06.2019 19:00, cassie2021
What are the solutions of the equation? 5z^2 + 9z - 2 = 0 a. 1, -2 b. 1, 2 c. 1/5, -2 d. 1/5, 2
Answers: 2
2. (20 points) Stainless steels can be susceptible to stress corrosion cracking under certain condit...
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