Problem 1.

Question

Three supermarket chains in the Denver area each claim 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 selected item was checked at each of the three chains on the same day. Use 0.05 level of significance.


Item Super$ Ralph's Lowblaws
1 $1.21 $1.20 $1.70
2 1.41 1.10 1.12
3 1.27 1.79 2.80
4 2.22 2.90 2.23
5 2.04 2.01 2.03
6 4.40 4.23 4.51
7 5.50 4.59 5.50
8 4.86 4.31 4.76
9 5.25 5.64 5.68

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What is the decision rule for both? (Round your answer to 2 decimal places.)


For Stores, reject H0 if F > _________
For Items, reject H0 if F > _________



Problem 2.

In an ANOVA table MSE was equal to 10. Random samples of six were selected from each of four populations, where the sum of squares total was 250.


(b) What is the decision rule? Use the .05 significance level. (Round your answer to 2 decimal places.)

Reject H0 if F> _________

Answer 1

You will need to determine degrees of freedom, then check an ANOVA table for level of significance. If the F-ratio exceeds the critical value from the table, then the null (H0) will be rejected.