Rebecca and Emma began arguing about who did better on their tests, but they couldn't decide who did bettergiven that they took different tests. Rebecca took a test in English and earned a 71, and Emma took a test inSocial Studies and earned a 70.4. Use the fact that all the students' test grades in the English class had a meanof 71.5 and a standard deviation of 10.7, and all the students' test grades in Social Studies had a mean of 64.1and a standard deviation of 9.5 to answer the following questions.a) Calculate the z-score for Rebecca's test grade.b) Calculate the z-score for Emma's test grade.= Zc) Which person did relatively better?RebeccaO EmmaO They did equally well.

Rebecca earned a test grade of 71 in English. The mean and standard deviation of test grades in…

Answered: Rebecca and Emma began arguing about…

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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The mean earning of men in Florida differs significantly from the mean earning of men in Texas. If the number of men in Florida is a sample of 123 and the number of men sampled in Texas is 88 how many degrees of freedom are there?
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DeAndre and Jonah began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. DeAndre took a test in Science and earned a 81.2, and Jonah took a test in Art History and earned a 61.9. Use the fact that all the students' test grades in the Science class had a mean of 72.2 and a standard deviation of 11.8, and all the students' test grades in Art History had a mean of 65.5 and a standard deviation of 10.3 to answer the following questions. a) Calculate the z-score for DeAndre's test grade. Z= b) Calculate the z-score for Jonah's test grade. Z= c) Which person did relatively better? DeAndre Jonah They did equally well. Question Help: Message instructor Submit Question
Natalie and Stephanie began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Natalie took a test in Social Studies and earned a 80.7, and Stephanie took a test in Math and earned a 65.5. Use the fact that all the students' test grades in the Social Studies class had a mean of 74.2 and a standard deviation of 10.3, and all the students' test grades in Math had a mean of 65.2 and a standard deviation of 10.5 to answer the following questions. a) Calculate the z-score for Natalie's test grade.z= b) Calculate the z-score for Stephanie's test grade.z= c) Which person did relatively better? NatalieStephanieThey did equally well.
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Two teachers have a friendly rivalry. They want to know which of their students did better on their respective final exams. The first teacher teaches chemistry and her 49 students had a mean = 68. The national mean and standard deviation for this exam is 65 and 10, respectively. The second teacher teaches history and his 64 students had a mean = 72. The national mean and standard deviation for this exam is 70 and 7, respectively. Taking into account the average performance of students on chemistry and history exams nationwide, which teachers' students did better on their respective final exams?
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A human resources manager for a company had a choice of how to administer an aptitude test for employee recruits. The New form of the test was administered via computer. The Old form had the same content, but was delivered via paper and pencil. The manager wanted to know if the tests were equivalent in terms of mean scores. If they were equivalent, the manager could give the test by either method, but if they were not equivalent, the manager would have to stick with one administration method in order to be fair to all recruits taking the test. The manager formed his hypotheses, and set an alpha level of .05. The results of a hypothesis test using the two administration methods is shown below. What should the manager do? t-Test: Two-Sample Assuming Equal Variances New Old Mean 15 11.1 13.33333 18.76667 Variance Observations 10 10 Pooled Variance 16.05 Hypothesized Mean Difference df 18 t Stat 2.176768 P(T<=t) one-tail t Critical one-tail 0.021526 1.734064 P(T<=t) two-tail t Critical…
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