A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol.

A financial advisor wondered whether the mean rate of return of healthcare, consumer goods, and technology stocks differed over the past five years. She obtained a simple random sample of 14 companies from each of the three sectors and obtained five-year rates of return. The means and standard deviations of the rates of return are given below.

Mean Rate of Return	Standard Deviation	Group
11.601	3.656	Health Care
8.504	3.217	Consumer Goods
15.082	5.798	Technology

An ANOVA F test was run on the data. Below is a portion of the results:

Source	df	Sums of squares	Mean square	F-ratio
Group		303.2
Error			19.1
Total