In testing a certain kind or truck tire over rugged terrain, it is found that 30% of the trucks fail to complete the test run without a blowout.(a) of the next 15 trucks tested, how many of them would you expect to have blowouts?(b) What is the variance of the number of blowouts experienced by the 15 trucks? What does that mean?(a) trucks are expected to have blowouts.(Type an integer or a decimal. Do not round.)(b) Select the correct choice below and fill in the answer boxes to complete your choice.(Type integers or decimals. Do not round.)OA. The variance is, which means that the expected value of the squared deviation from the mean isOB. The variance is, which means that the difference between the lowest possible number of blowouts and the highest possible number is

Answered: In testing a certain kind or truck tire…

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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Pew Research surveyed a random sample of 1,313 U.S. adults in 2011. They asked them: "How important is it, to you personally, to be successful in a high-paying career or profession?" Importance Very important Somewhat important Not important Total Chi-square test Statistic Chi-square total female male 403 408 811 (66.1%) (58.0%)| (61.8%) 158 218 376 (25.9%) (31.0%) (28.6%) 49 77 126 (8.0%) (11.0%) (9.6%) 610 703 1313 (100%) (100%) (100%) df Value P-value 2 9.287 0.0096 We want to test if men and women have the same ideas about the importance of this kind of success. What are the hypotheses?
We are interested in determining whether or not the variances of the sales at two music stores (A and B) are equal. A sample of 16 days of sales at store A has a sample variance of 20 while a sample of 26 days of sales from store B has a sample variance of 30. The test statistic is (A) 1.50 (B) 1.69 (C) 2.25 (D) 2.50
Up-County Associates is hired to estimate the proportion of county households that own three or more automobiles. They conducted their survey using a simple random sample of 250 randomly selected households and found that 23% of those households owned three or more automobiles. (a) Is the proportion, 23%, a parameter or a statistic? Explain. (b) If Up-County Associates were to continually choose simple random samples of 250 randomly selected households, each time recording the proportion of households in the sample owning three or more automobiles, what would be the “shape” of the resulting distribution of all these sample proportions? Explain. (c) Suppose now that survey company Lower-County Polling also conducted a survey to determine the proportion of county households that own three or more automobiles, but they surveyed only 100 randomly selected households. If Lower-County Polling were also to sample over and over again (using simple random samples…
Question: Recent surveys have shown a decline in the percentage of U.S. households with cable TV. In one city, a simple random sample of 468 households had 117 households reporting they had cable TV, and 351 households reporting they did not. (a) Show the “plug-in” box to represent our best guess for the relative frequency of people with and without cable. (Let 1 correspond to with cable and 0 without). (b) The percentage of households in the city with cable TV is estimated to be ___________%, and this estimate is likely to be off by about ___________% or so.(c) A 90%-confidence interval for the percentage of households in the city with cable TV goes from ___________% to ___________%.
Is the variance for the amount of money, in dollars, that shoppers spend on Saturdays at the mall the same as the variance for the amount of money that shoppers spend on Sundays at the mall? Saturday Sunday Saturday Sunday 75 44 62 137 18 58 0 82 150 61 124 39 94 19 50 127 62 99 31 141 73 60 118 73 89 What is the null hypothesis? What is the alternative hypothesis? What is the degrees of freedom (numerator)? What is the degrees of freedom (denominator)? What is the f statistic? What is the result? What is the p-value? Conclusion?
A researcher uses analysis of variance to test for mean differences among three treatments with a sample of n=12 in each statement.The F-ratio for this analysis would have which df values? df=2,11 df=2,33 df=2,35 df=2,36

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