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. Final examination scores from a random sample of students enrolled today and from a random sample of students enrolled five years ago were selected.
Today Five years ago
x bar 82 88
σ squared 112.5 54
η 45 36
The 95% confidence interval for the difference between the two population means is .
a. -9.92 to -2.08
b. -3.92 to 3.92
c. -13.83 to 1.84
d. -24.228 to 12.23
Answers: 1
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