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Chi-square Test of Goodness of Fit

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One-year sales volume of four similar 20-oz. beverages on a college campus is shown. (a) make a bar chart and describe it. (b) Calculate expected frequencies for each class. (c) Perform the chi-square test for a uniform distribution. At ?=.05, does this sample contradict the assumption that sales are the same for each beverage? Calculate both observed and expected frequencies.
Beverage Sales (Cases)
Frappuccino Coffee 18
Frappuccino Moca 23
Frappuccino Vanilla 23
Frapuccino Caramel 20
Total 84

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The solution provides step by step method for the calculation of chi square test of goodness of fit. Formula for the calculation and Interpretations of the results are also included.

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Chi-square Test of Goodness of Fit
One-year sales volume of four similar 20-oz. beverages on a college campus is shown. (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class. (c) Perform the chi-square test for a uniform distribution. At a=.05, does this sample contradict the assumption that sales are the same for each beverage? Calculate both observed and expected frequencies.
Beverage Sales (Cases)
Frappuccino Coffee 18
Frappuccino Moca 23
Frappuccino Vanilla 23
Frapuccino Caramel 20
Total 84

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(a) Make a bar chart and describe ...

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