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Chi-square test of goodness of fit: Grade distribution

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A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% A's, 26% B's, 31% C's, 19% D's and 10% F's. A sample of n=200 psychology students from last semester produced the following grade distribution:

A B c D F
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32 61 64 31 12
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Do the data indicate a significant change in the grade distribution? Test at the .05 level of significance.

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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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A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% As,26% Bs,31% Cs,19% Ds and 10% Fs. A sample of n=200 psychology students from last semester produced the following grade distribution:
A B ...

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