(Answered) A biology professor claimed that the proportions of grades

Statistics

A biology professor claimed that the proportions of grades in his classes are the same. A sample of 100 students showed the following frequencies:

Grade A B C D E

Frequency 18 20 28 23 11

State the null and alternative hypotheses to be tested.

Determine the rejection region at the 5% significance level.

Compute the value of the test statistics.

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