A researcher selected a random sample of 10 psychology graduates and found the stan- dard deviation of their grade point average was 0.72. Then she selected a random sam- ple of 14 engineering students and found that the standard deviation of their grade point average was 0.51. At a = 0.01, can we conclude that the variance of the grade point averages of the psychology graduates is greater than the variance of the grade point av- erages of the engineering graduates? %3D
A researcher selected a random sample of 10 psychology graduates and found the stan- dard deviation of their grade point average was 0.72. Then she selected a random sam- ple of 14 engineering students and found that the standard deviation of their grade point average was 0.51. At a = 0.01, can we conclude that the variance of the grade point averages of the psychology graduates is greater than the variance of the grade point av- erages of the engineering graduates? %3D
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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Transcribed Image Text:A researcher selected a random sample of 10 psychology graduates and found the stan-
dard deviation of their grade point average was 0.72. Then she selected a random sam-
ple of 14 engineering students and found that the standard deviation of their grade point
average was 0.51. At a = 0.01, can we conclude that the variance of the grade point
averages of the psychology graduates is greater than the variance of the grade point av-
erages of the engineering graduates?
Transcribed Image Text:These data represent the record high temperatures in degrees Fahrenheit (°F) for each of
the 50 states. Construct a grouped frequency distribution for the data, using 7 classes.
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