A sample of 19 joint specimens of a particular type provided a sample mean proportional limit stress of 8.55 MPa and a sample standard deviation of 0.72 MPa.**(a) Calculate and interpret a 95% lower confidence bound for the true average proportional limit stress of all such joints. (Round your answer to two decimal places.)**Lower confidence bound: **8.26 MPa** ✔️**Interpret this bound:**- With 95% confidence, we can say that the value of the true mean proportional limit stress of all such joints is greater than this value. ✔️**What, if any, assumptions did you make about the distribution of proportional limit stress?**- We must assume that the sample observations were taken from a normally distributed population. ✔️**(b) Calculate and interpret a 95% lower prediction bound for proportional limit stress of a single joint of this type. (Round your answer to two decimal places.)**Lower prediction bound: **7.24 MPa** ❌

From given data we have : n=19 x=8.55 s=0.72

Answered: A sample of 19 joint specimens of a…

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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A company claims that the mean monthly residential electricity consumption in a certain region is more than 880 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 920 kWh. Assume the population standard deviation is 129 kWh. At a = 0.01, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and H.. Choose the correct answer below. O A. Ho: u= 880 (claim) ΥΒ. H: μs 880 H:u#880 Ha:u> 880 (claim) O C. Ho: u> 920 (claim) Ο D. Hλ: μ5 920 H: us 920 Ha:u>920 (claim) O E. Ho: u> 880 (claim) H:us 880 OF. Ho: H=920 Ha:u#920 (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 values are + B. The critical value is 2.33 Identify the rejection region(s). Select the correct choice below. O A. The rejection region…
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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
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55°F Clear Heights were measured for a random sample of 15 plants grown while being treated with a particular nutrient. The sample mean and sample standard deviation of those height measurements were 50 centimeters and 12 centimeters, respectively. Assume that the population of heights of treated plants is normally distributed with mean u. Based on the sample, can it be concluded that μ is different from 42 centimeters? Use the 0.10 level of significance. Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) (a) State the null hypothesis Ho and the alternative hypothesis H₁. H:0 H₁ : (b) Determine the type of test statistic to use. (Choose one) ▼ (c) Find the value of the test statistic. (Round to three or more decimal places.) 0 (d) Find the p-value. (Round to three or more decimal places.) Jxplanation Check O Search C 3…
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