It Is Widely Believed That a Person's Level of Fitness

Multiple Choice

It is widely believed that a person's level of fitness prior to undergoing corrective knee surgery is an important factor in the speed of rehabilitation following surgery.A study was undertaken with 24 randomly selected male subjects who were to undergo such surgery.The physical fitness status of each subject before the surgery was categorized as being below average (n = 8) ,average (n = 10) ,or above average (n = 6) .Following surgery,the number of days spent in physical therapy by each patient until fully rehabilitated was determined.Examination of side-by-side boxplots indicated that it was reasonable to assume that the samples came from populations with equal standard deviations. The following ANOVA table was obtained.(Some entries have been replaced with _**.) What is the value of the estimate for the common population variance,
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A) 4.45
B) 336.0
C) 47.3
D) 20.40
E) None of the above