Hypothesis Testing: ANOVA and Kruskal Wallis Test
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1 There are four McDonalds restaurants in a particular area. The numbers of burgers sold at the respective restaurants for each of the last 4 days are shown below.
Restaurant
1 2 3 4
Day 1 81 79 55 36
2 83 69 65 45
3 67 59 58 62
4 77 69 73 58
Restaurant sum of squares= 1793.25
Day sum of squares= 250.25
Total sum of squares= 2841.75
i) Construct ANOVA table for the above data.
ii) Test at the 5% significance level to determine if differences exist among the restaurants
iii) Test at the 5% significance level to determine if differences exist among the four days
iv) Calculate Tukey's criticalnumber w at the 5% level of significance and perform the comparison between Restaurant 1 and 2
2 Bank A is interested in determining how long it takes one of its tellers to complete a transaction as compared to two other banks B and C. The following results were obtained.
Time to complete transaction
Bank A Bank B Bank C
12 23 15
14 8 20
11 17 21
16 9 7
10 13 22
24
Using Kruskal- wallis test, determine whether there is any difference in the completion time of these banks. Use alpha = 5%
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Answers questions on hypothesis testing using ANOVA and Kruskal Wallis test
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