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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 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 |
|
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