The accompanying data represent the discrete probability distribution for the nu

Question

The accompanying data represent the discrete probability distribution for the number of stars that reviewers gave a first edition statistics reference book. The second edition of this reference book has been released and a random sample of people that have purchased the book has been collected with the accompanying results. The publisher would like to know if the probability distribution for reviews has changed from the first edition to the second edition using alphaequals=0.025. What is the test statistic for this sample? Round to two decimal places.

First Edition Distribution Stars Probability 25% 35% 20% 10% 10% Second Edition Results Stars Frequency 28 28 13

Explanation / Answer

It follows Chi Square Distribution.

The data below should be self-explanatory. The only thing to note is that if you want to redo the calculation, you should press the "Restart Calculation" button (rather than using your browser back button).

The Chi^2 value is: 5.388

The Chi^2 value is 5.388. The P-Value is 0.25. The result is not significant at p=0.025.

Observed Expected Difference Difference Sq. Diff. Sq. / Exp Fr. 5 28 20   8.00   64.00   3.20 4 28 28   0.00   0.00   0.00 3 13 16   -3.00   9.00   0.56 2 6 8   -2.00   4.00   0.50 1 5 8   -3.00   9.00   1.12   5.388

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