One year sales volume of four similar 20-oz. beverages on a college campus is shown. The expected frequency for each beverage is 21, found by 84/4. Using the chi square test for uniform distributions, does the sample contradict the assumption that sales are the same for each beverage? Why or why not? The significance level is .05.
Goodness of Fit Test
observed
expected
O - E
(O - E)² / E
% of chisq
18
21.000
-3.000
0.429
50.00
23
21.000
2.000
0.190
22.22
23
21.000
2.000
0.190
22.22
20
21.000
-1.000
0.048
5.56
84
84.000
0.000
0.857
100.00
.86
chi-square
3
df
.8358
p-value