An article presents a method, based on a modal pushover analysis, of estimating the hysteretic energy demand placed on a structureby an earthquake. A sample of 18 measurements had a mean error of 457.8 kNm with a standard deviation of 317.7 kNm. An engineerclaims that the method is unbiased, in other words, that the mean error is O. Can you conclude that this claim is false? Find the P-valueand state a conclusion.

To test the engineer's claim that the method is unbiased (i.e., the mean error is 0), we can perform…

Answered: An article presents a method, based on…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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8:50 AA www-awn.aleks.com O DESCRIPTIVE STATISTICS Approximating the standard deviation of a data set. Reyesburg Corporation is contemplating using a new, more expensive glue in the construction of its laminated veneer lumber. Of importance to the company is the variability of the carrying load of the lumber. The company has tested 20 beams using the new glue, recording for each beam the pressure (in pounds per square foot) at which the beam breaks. The data collected are presented in the following histogram: Frequency 920 Carrying load (in pounds per square foot) 900 Based on this histogram, estimate the standard deviation of the sample of 20 carrying loads. Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place. (If necessary, consult a list of formulas.) Explanation Check Terms of UseI Privacy I Accessibility
Please answer parts A,B and C. Thank you.
Please answer question b.
You are studying the velocities of projectiles. Prior experience tells you that standard deviation of velocities is around 9.7 ft/sec. How many independent samples of projectile velocity do you have to measure to estimate the mean velocity within ±±0.98 ft/sec with 92% confidence?
A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 66 residential customers has a mean monthly consumption of 900 kWh. Assume the population standard deviation is 123 kWh. At a = 0.10, can you support the claim? Complete parts (a) through (e). B. The critical value is 1.28 Identify the rejection region(s). Select the correct choice below. O A. The rejection regions are z 1.28 OB. The rejection region is z > 1.28 OC. The rejection region is z< 1.28. (c) Find the standardized test statistic. Use technology. The standardized test statistic is z = (Round to two decimal places as needed.)
I keep getting P-value incorrect. Please help, WILL thumbs up if correct.
A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 60 residential customers has a mean monthly consumption of 880 kWh. Assume the population standard deviation is 123 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e). (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. O A. Fail to reject Ho because the standardized test statistic is in the rejection region. O B. Reject Ho because the standardized test statistic is in the rejection region. O C. Fail to reject Ho because the standardized test statistic is not in the rejection region. O D. Reject Ho because the standardized test statistic is not in the rejection region. (e) Interpret the decision in the context of the original claim. At the 5% significance level, there enough evidence to V the claim that the mean…
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.78. (c) How large a sample size is necessary if the width of the 95% interval is to be 0.31? (Round your answer up to the nearest whole number.) ? specimens (I have answers for a, b, and d I just need help with c, the answer is not 24.32)
A company claims that the mean monthly residential electricity consumption in a certain region is more than 870 kiloWatt-hours (kWh). You want to test this claim. You find that a random sample of 70 residential customers has a mean monthly consumption of 890 kWh. Assume the population standard deviation is 120 kWh. At a= 0.01, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and Ha. Choose the correct answer below. O B. Ho: µs870 O A. Ho: p> 870 (claim) H3: us 870 Ha p> 870 (claim) O C. Ho: us890 Ha: p>890 (claim) O D. Ho µ > 890 (claim) Ha ps 890 O E. Ho u= 870 (claim) Ha: µ#870 OF. Ho H= 890 H p#890 (claim) (b) Find the critical value(s) and identify the rejection region(s). Select the correct choice below and fill in the answer box within your choice. Use technology. (Round to two decimal places as needed.) O A. The critical value is OB. The critical values are + Click to select your answer(s).
A random sample of 78 eighth grade students' scores on a national mathematics assessment test has a mean score of 275. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270. Assume that the population standard deviation is 33. At a= 0.11, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). Ο D. Ho: μ 270 (b) Find the standardized test statistic z, and its corresponding area. z= 1.34 (Round to two decimal places as needed.) (c) Find the P-value. P-value = 0.0901 (Round to three decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis. Reject Ho Fail to reject Ho

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