Suppose your statistics professor reports test grades as z-scores, and you got a score of 2.11 on an exam.Ka) Write a sentence explaining what that means.b) Your friend got a z-score of -2. If the grades satisfy the Nearly Normal Condition, about what percent of the classscored lower than your friend?a) Choose the correct answer below.C...OA. The score was 2.11 standard deviations higher than the mean score in the class.OB. The score was 2.11 points lower than the mean score in the class.OC. The score was 2.11 standard deviations lower than the mean score in the class.OD. The score was 2.11 points higher than the mean score in the class.b) About % of the class scored lower than your friend.

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Answered: Suppose your statistics professor…

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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Please solve in a descriptive statistic way
Mariah and Amanda began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Mariah took a test in English and earned a 81, and Amanda took a test in Art History and earned a 61.8. Use the fact that all the students' test grades in the English class had a mean of 75.7 and a standard deviation of 9, and all the students' test grades in Art History had a mean of 60.7 and a standard deviation of 10.3 to answer the following questions.a) Calculate the z-score for Mariah's test grade.z=b) Calculate the z-score for Amanda's test grade.z=c) Which person did relatively better? Mariah Amanda They did equally well.
Suppose that 10 students have taken an exam and that the mean and median scores are both 60. (Since 10 is an even number you can assume that two scores in the middle are both 60.) Two more students take it and one scores 70 and the other scores 26. If these students are now included, what is the new mean? What is the new median?
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