The manager of a company recorded the number of hours his employees worked during each of two weeks. The following statistics were calculated. *Week 1: The mean was 35 hours with a standard deviation of 1.5 hours.
*Week 2: The meal was 40 hours with a standard deviation of 2.0 hours.
The manager concluded that there was more variation in the number of hours worked for Week 2 than for Week 1. The manager's conclusion was -
A. valid because the mean for Week 2 was greater than for Week 1
B. valid because the standard deviation for Week 2 was greater than the standard deviation for Week 1
C. invalid because the mean for Week 1 was less than the mean for Week 2
D. invalid because the standard deviation for Week 1 was less than the standard deviation for Week 2.