Question
Correlation
Three data sets are collected, and the correlation coefficient is computed in each case. The variables are:
1) grade point average in freshman year and in sophomore year
2) grade point average in freshman year and in senior year
3) Lenght and weight of two-by-four boards
Possible values for correlation coefficient are:
-0.50 0.0 0.30 0.60 0.95
Match the correlations with the data sets; two will be left over. Explain your choices
1) grade point average in freshman year and in sophomore year
2) grade point average in freshman year and in senior year
3) Lenght and weight of two-by-four boards
Possible values for correlation coefficient are:
-0.50 0.0 0.30 0.60 0.95
Match the correlations with the data sets; two will be left over. Explain your choices
Answers
1) grade point average in freshman year and in sophomore year: 0.60
2) grade point average in freshman year and in senior year: 0.30
3) Lenght and weight of two-by-four boards: 0.95
all of these should have some sort of positive correlation, so that leaves out -0.50 and 0.0
3) is the result of a manufacturing process so should have a very high correlation
1) should be stronger than 2)
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