A sample of ultimate tensile strength observations (ksi) was taken. Use the accompanying descriptive statistics output from Minitab to calculate a99% lower confidence bound for true average ultimate tensile strength, and interpret the result. (Round your answer to two decimal places.)N153Mean134.37Median134.38TrMean St Dev134.39 4.58SE Mean0.37Minimum122.20Maximum147.70We are 99% confident that the true average ultimate tensile strength is greater thanYou may need to use the appropriate table in the Appendix of Tables to answer this question.Q1133.85ksi.Q3137.25

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Answered: A sample of ultimate tensile strength…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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You'd like to test the null hypothesis that the means of the two samples (column A and column B) are the same. The alternative hypothesis is that they are not the same. You have no reason to believe that the standard deviations of the two samples are equal. Test at the alpha = 0.10 level. After using Excel, what do you conclude? Are the means the same?
Fuel economy estimates for automobiles built one year predicted a mean of 26.2 mpg and a standard deviation of 6.8 mpg for highway driving. Assume that a Normal model can be applied. Use the 68-95-99.7 Rule to complete parts a) through e). ntent an a) Draw the model for auto fuel economy. Resou c. OA. O B. 94 ble Res 60% se Opti pas unicati 95 5.8 126 194 26.2 03 39.0 466 16 194 22D 26.2 296 33 36.4 67 5A 12.6 19.4 26.2 39.8 53.4 b) In what interval would you expect the central 99.7% of autos to be found? Using the 68-95-99.7 rule, the central99.7% of autos can be expected to be found in the interval from to mpg. Click to select your answer(s). Next
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Wheaties cereal is claimed to have an average of 3 grams of dietary fiber per serving. We want to test this hypothesis and to see whether we believe that is true or that the mean amount of fiber is significantly different from 3 grams. A random sample of 25 servings was taken and it yielded a sample mean of 3.4 grams with the sample standard deviation in the amount of fiber, s = .8 grams. %3D Assume that software has determined the p-value to be.02. Carry out the test at the 5% level of significance. Be sure to state your decision rule and your decision for the test. O Fail to Reject the null hypothesis since the p-value is .05 O Fail to Reject the null hypothesis since the p-value is > .05
answer b
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You have a really annoying stapler that seems to randomly jam. On any given attempt to staple, it seems to independently jam 18.1% of the time. 360 attempts were made use the stapler. a) Find the mean and standard deviation for the number of jammed staples out of 360 attempts. Mean: Standard Deviation (rounded to 2 decimals): b) Does the normal approximation apply? Is the success / failure condition met (using a cutoff of 5)? No Yes c) Use the normal distribution (with continuity correction) to find the probability that your stapler will jam more than 79 times out of 360 attempts. Use the rounded standard deviation in your calculation. z-score (to 2 decimals) = probability (to 4 decimals, using the rounded z-score)
*10.3.87 Question Help Preliminary analyses indicate that you can consider the assumptions for using nonpooled t-procedures satisfied. Researchers obtained the following data on the number of acute postoperative days in the hospital using the dynamic and static systems. Obtain a 90% confidence interval for the difference, u, -H2, between the mean numbers of acute postoperative days in the hospital with the dynamic and static systems. (Note: x, = 8.17, $, = 1.85, x2 = 9.50, and s, = 3.27) Dynamic 9 10 10 10 7 7 10 8 Static 7 8 6 9 14 13 The 90% confidence interval is from to (Round to three decimal places as needed.)
Research suggests a link between mothers alcohol consumption with the birth weight of newborns. Random sampke of 100 mothers who drank during pregnancy, average birth weight od their babies is 7.2 lbs. Average birth weight nationwide is 7.8 lbs. And standard deviation is 1.56. Do mothers who drink have babiea that are significantly smaller compared to nationwide? Use alpha = 01. A. State the null abd the research hypothesisB. Identify the critical values of z or t used to define the decision ruleC. Calculate the test statisticD. Report the p-valueE. Report your findings
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