La Suppose the midterm grades for 10 students are the following: 70, 65, 75, 80, 63, 90, 71, 75, 93, 83. Treat these data as sample data. Using R, show what happens to the variance of the grades if each of the following happens. Attach R code. (a) The teacher added 5 marks to everyone's grades. (b) The teacher subtracted 5 marks from everyone's grades. (c) The teacher multiplied everyone's grades by 5. (d) The teacher divided everyone's grades by 5.
La Suppose the midterm grades for 10 students are the following: 70, 65, 75, 80, 63, 90, 71, 75, 93, 83. Treat these data as sample data. Using R, show what happens to the variance of the grades if each of the following happens. Attach R code. (a) The teacher added 5 marks to everyone's grades. (b) The teacher subtracted 5 marks from everyone's grades. (c) The teacher multiplied everyone's grades by 5. (d) The teacher divided everyone's grades by 5.
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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Transcribed Image Text:La Suppose the midterm grades for 10 students are the following: 70, 65, 75, 80,
63, 90, 71, 75, 93, 83. Treat these data as sample data. Using R, show what happens to
the variance of the grades if each of the following happens. Attach R code.
(a) The teacher added 5 marks to everyone's grades.
(b) The teacher subtracted 5 marks from everyone's grades.
(c) The teacher multiplied everyone's grades by 5.
(d) The teacher divided everyone's grades by 5.
26
What happens to the variance of a set of scores if
(a) A constant a is added to each score in the set?
(b) A constant a is subtracted from each score in the set?
(c) Each score is multiplied by a constant a?
(d) Each score is divided by a constant a?
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