A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information. Five Today Years Ago 85 87 g2 112.5 54 45 36 Find the point estimate for the difference between the means of the two populations. O -9 O -2 O 9 58.5

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