The class sizes of the Introductory Psychology courses at a college are shown below. 121, 134, 106, 93, 149, 130, 119, 128 The college adds a new Honors Introductory Psychology course with 45 students. What effect does the new class size have on the center and spread of the class sizes of the Introductory Psychology courses at the college?
Answers
Given : The class sizes of the Introductory Psychology courses at a college are shown below. 121, 134, 106, 93, 149, 130, 119, 128 .
The college adds a new Honors Introductory Psychology course with 45 students.
To Find : What effect does the new class size have on the center and spread of the class sizes
Solution:
Class Sizes
121, 134, 106, 93, 149, 130, 119, 128
arrange in order
93 , 106, 119, 121, 128 , 130, 134,149
Median = (121 + 128)/2
= 124.5
Mean = (93 + 106 + 119 + 121 + 128 + 130 + 134 + 149 )/8
= 122.5
No Mode
Range = 149 - 93 = 56
Psychology course with 45 students.
45, 93 , 106, 119, 121, 128 , 130, 134,149
Median = 121
Mean = (45 + 93 + 106 + 119 + 121 + 128 + 130 + 134 + 149 )/9
= 113.9
No Mode
Range = 149 - 45 = 104
Effect on center
Mean & Median Decreased
Effect on spread
Range increased
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