Suppose a 95% confidence interval for the difference in test scores between Class 1 and Class 2 (in that order) is the following: 9 +/− 2. These results were base
Suppose a 95% confidence interval for the difference in test scores between Class 1 and Class 2 (in that order) is the following: 9 +/− 2. These results were based on independent
A) You can't do it this way. You'll get negative numbers for the difference in the means and/or negative numbers for the standard error.
B) You are confident that the average for Class 2 is 7 to 11 points lower than for Class 1.
C) You are still confident that the classes have significantly different
D) Your 95% confidence interval will now be entirely negative: from −7 to −11.
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