Four OEM brands of mobile phone batteries are to be compared by testing each brand in six mobile phones. Twenty four mobile phones are randomly selected and divided randomly into four groups of six mobile phones each. Then each group of mobile phones uses a different brand of battery. The lifetimes of the batteries, to the nearest hour, are shown below. Battery brand A Battery brand B Battery brand C Battery brand D 39 27 28 25 28 32 24 20 42 31 36 21 30 36 33 32 28 28 28 38 28 40 27 28 Using o = 0.01, does there appear to be a difference in mean lifetime among the four brands of batteries? a. What is the value of F critical? [ Select ] [ Select ] 4.94 b. What is the value of calculated 4.04 4.72 4.44 c. State the conclusion. [ Select ]Four OEM brands of mobile phone batteries are to be compared by testing each brand in six mobile phones. Twenty four mobile phones are randomly selected and divided randomly into four groups of six mobile phones each. Then each group of mobile phones uses a different brand of battery. The lifetimes of the batteries, to the nearest hour, are shown below. Battery brand A Battery brand B Battery brand C 39 Battery brand D 27 28 28 25 32 24 42 20 31 36 30 21 36 33 28 32 28 28 28 38 40 27 28 Using o = 0.01, does there appear to be a difference in mean lifetime among the four brands of batteries? a. What is the value of F critical? [ Select ] b. What is the value of calculated F? [ Select ] [ Select ] 2.763 c. State the conclusion. [ Select ] 1.147 4.221 3.150Four OEM brands of mobile phone batteries are to be compared by testing each brand in six mobile phones. Twenty four mobile phones are randomly selected and divided randomly into four groups of six mobile phones each. Then each group of mobile phones uses a different brand of battery. The lifetimes of the batteries, to the nearest hour, are shown below. Battery brand A Battery brand B Battery brand C Battery brand D 39 27 28 25 28 32 24 20 42 31 36 21 30 36 33 32 28 28 28 38 28 40 27 28 Using o = 0.01, does there appear to be a difference in mean lifetime among the four brands of batteries? a. What is the value of F critical? [ Select ] b. What is the value of calculated F? [ Select ] c. State the conclusion. [ Select ] Select ] There is not enough evidence to conclude that the mean lifetimes of the OEM brands of batteries differ. There is evidence to conclude that the mean lifetimes of the OEM brands of batteries differ