A stock analyst wondered whether the mean rate of return of financial, energy an

Question

A stock analyst wondered whether the mean rate of return of financial, energy and obtained a simple random sample of eight companies from each of the three sector the accompanying table (in percent) Complete parts (a) through (d) below. each other, and the populations are normally distributed and have different Yes, because there are k = 3 simple random samples one from each of k each other and the populations are normally distributed and have the same No. because the largest sample standard deviation is more than twice the No. because there are k = 3 simple random samples one from each of k other and the populations are normally distributed and have the same (c) Are the mean rates of return different at the a = 0 05 level of significance? Use technology to find the F-test statistic for this data set. F_0 = (Round to two decimal places as needed.)

Explanation / Answer

from above F =2.01025

SUMMARY Groups Count Sum Average Variance financial 8 92.84 11.605 26.52706 Energy 8 110.99 13.87375 23.63774 Utilities 8 71.2 8.9 20.61311 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 99.20651 2 49.60325 2.102489 0.147128 3.4668 Within Groups 495.4454 21 23.59264 Total 594.6519 23

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