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Good Evening I need answers to these questions please, 1.) Part 1? Type I error: A company that manufactures steel wires guarantees that the mean
Good Evening I need answers to these questions please,
1.) Part 1?
Type I error: A company that manufactures steel wires guarantees that the mean breaking strength (in kilonewtons) of the wires is greater than 50. They measure the strengths for a sample of wires and test H0: [1. = 50 versus H1 : p. > 50. If a Type I error is made, What conclusion will be drawn regarding me mean breaking strength? 50- The conclusion will be that the mean breaking strength is less than greater than less than or ureater than A test is made of Ho: u = 20 versus H: u # 20. A sample of size n = 58 is drawn, and x = 18. The population standard deviation is 6 = 8. (a) Compute the value of the test statistic z. (b) Is Ho rejected at the a = 0.05 level? (c) Is Ho rejected at the a = 0.01 level? Part: 0 / 3 Part 1 of 3 (a) Compute the value of the test statistic. Round the answer to at least two decimal places. ZA test of Ho: u = 53 versus H, : u # 53 is performed using a significance level of a = 0.05. The value of the test statistic is Z = -1.97. Part: 0 / 3 Part 1 of 3 Determine whether to reject Ho. Since the test statistic (Choose one) in the critical region, we (Choose one) Ho at X 5 the a = 0.05 level. is not isFacebook: A study showed that two years ago, the mean time spent per visit to Facebook was 19.9 minutes. Assume the standard deviation is o = 6.0 minutes. Suppose that a simple random sample of 103 visits was selected this year and has a sample mean of x = 20.9 minutes. A social scientist is interested to know whether the mean time of Facebook visits has increased. Use the a = 0.01 level of significance and the P-value method with the TI-84 calculator. (a) State the appropriate null and alternate hypotheses. (b) Compute the P-value. (c) State a conclusion. Use the a = 0.01 level of significance. Part: 0 / 4 Part 1 of 4 (a) State the appropriate null and alternate hypotheses. HO: 00 0=0 H1: H This hypothesis test is a (Choose one) V test. right-tailed X 5 left-tailed two-tailedCalibrating a scale: Making sure that the scales used by businesses in the United States are accurate is the responsibility of the National Institute for Standards and Technology (NIST) in Washington, D.C. Suppose that NIST technicians are testing a scale by using a weight known to weigh exactly 1000 grams. The standard deviation for scale reading is known to be 6 = 3.2. They weigh this weight on the scale 58 times and read the result each time. The 58 scale readings have a sample mean of; = 1000.? grams. The calibration point is set too high if the mean scale reading is greater than 1000 grams. The technicians want to perform a hypothesis test to determine whether the calibration point is set too high. Use the at: 0.10 level of signicance and the Pvalue method with the 1184 calculator. Part: 0 I 4 Part 1 of4 State the appropriate null and alternate hypotheses. HoD EIStep by Step Solution
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