The chi-square test statistic is given as follows:
5.2.
The chi-square test statistic is calculated as sum of the differences squared between the observed measures and the expected measures, divided by the number of observations.
The expected measure for this problem is of:
20.
The observed measures were of:
28, 20, 18, 14.
Hence the test statistic is calculated as follows:
1/20[(28 - 20)² + (20 - 20)² + (18 - 20)² + (14 - 20)²] = 5.2.
More can be learned about the test of an hypothesis at brainly.com/question/13873630
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