MAT 165 Introduction to Statistics JAIMELYNN MILLER 05/01/22 9:40 AM Save Homework: Hw 25 Ch 8.5 Test Hypothesis t- stat

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Mat 165 Introduction To Statistics Jaimelynn Miller 05 01 22 9 40 Am Save Homework Hw 25 Ch 8 5 Test Hypothesis T Stat 1 (129.22 KiB) Viewed 42 times

MAT 165 Introduction to Statistics JAIMELYNN MILLER 05/01/22 9:40 AM Save Homework: Hw 25 Ch 8.5 Test Hypothesis t- statistic Question 9, 8.5.65 Part 3 of 4 HW Score: 48.46%, 4.36 of 9 points Points: 0.25 of 1 To protect against earthquake damage, steel beams are typically fitted and connected with plastic hinges. However, these plastic hinges are prone to deformations and are difficult to inspect and repair. An alternative method of connecting steel beams-one that uses high-strength steel bars with clamps-was investigated. Mathematical models for predicting the performance of these steel connecting bars assume the bars have a mean yield strength of 300 megapascals (MPa). To verify this assumption, the researchers conducted material property tests on the steel connecting bars. In a sample of three tests, the yield strengths were 357, 371, and 361 MPa. Do the data indicate that the true mean yield strength of the steel bars exceeds 300 MPa? Test using α = 0.01. Click the icon to view the Student t-distribution table. C Determine the null and alternative hypotheses. Choose the correct answer below. OA. Ho: H=300 B. Ho: μ=300 Hg: H < 300 Ha: μ>300 O C. Ho: H = 300 O D. Ho: μ#300 Ha: μ = 300 Ha: μ#300 Compute the value of the test statistics. t= 15.13 (Round to two decimal places as needed.) Determine the rejection region for this test. Choose the correct answer below and fill in the answer box(es) to complete your choice. (Round to three decimal places as needed.) A. The rejection region is t< <t< OB. The rejection region is OC. The rejection region is t> OD. The rejection region is t< X = + " ||| √i Vi Help me solve this Clear all or t> Textbook Get more help. (4) More Check answer