Textbook: Statistical Techniques in Business & Economics by Lind, Marchal, and W

Question

Textbook: Statistical Techniques in Business & Economics by Lind, Marchal, and Wathen 16th Ed

Ch.12, Ch. Exercise: #44 (Pg. 419)

The solution provided in Chegg is incomplete. Please update and provide the level of detail published for problem #43. For example, the F Critical numbers are missing.

44. Three supermarket chains in the Denver area each claims to have the lowest overall prices. As part of an investigative study on supermarket advertising, the Denver Daily News conducted a study. First, a random sample of nine grocery items was selected. Next, the price of each se- lected item was checked at each of the three chains on the same day. At the .05 significance level, is there a difference in the mean prices at the supermarkets or for the items? Lowblaws Ralph's Super$ Item $1.07 $1.02 $1.12 1.21 1.10 1.14 2.08 1.97 1.72 2.32 2.09 2.22 2.30 2.10 2.40 4.15 4.32 4.04 5.05 4.95 5.05 4.67 4.13 4.68 5.86 5.46 5.52

Explanation / Answer

H0: There is no significance difference between the mean prices of 3 super markets

H0: There is no significance difference between the mean prices of 3 super markets

From the given data,

One-way ANOVA: Super, Ralphs, Lowblaws

Source DF SS MS F P
Factor 2 0.14 0.07 0.02 0.977
Error 24 71.97 3.00
Total 26 72.10

Here P-value > alpha 0.05, we accept H0

Thus, we conclude that there is no significance difference between the mean prices of 3 super markets

Total Ti^2/ni Super 1.12 1.14 1.72 2.22 2.4 4.04 5.05 4.68 5.52 27.89 86.42801 Ralph's 1.02 1.1 1.97 2.09 2.1 4.32 4.95 4.13 5.46 27.14 81.84218 Lowblaws 1.07 1.21 2.08 2.32 2.3 4.15 5.05 4.67 5.86 28.71 91.5849 G= 83.74 259.8551

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