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