Point Biserial Correlation
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To test the effectiveness of a new studying strategy, a teacher randomly divides a sample of 8 students into tow groups, with n = 4 in each group. The students in group one receive training in the new studying strategy. Then all students are given 30 minutes to study a chapter before taking a quiz. The quiz scores for the two groups are as follows.
Training No Training
9 4
7 7
6 3
10 6
a. Convert these data into a form suitable for the point-biserial correlation. (Use X =1 for training, X = 0 for no training, and the quiz score for Y.)
b. Calculate the point-biserial correlation for these data
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Solution Summary
The solution discusses the method of determination of Point Biserial Correlation for a given data.
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Solution
a)
Student Coded Value(X) Quiz Score(Y)
1 1 9
2 1 7
3 1 6
4 1 10
5 0 4
6 0 7
7 0 3
8 0 6
b) To calculate the point-biserial correlation for the given data, we use the ...
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