For Questions , use the following narrative
Narrative: Classes 1 and 2
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 samples of size 100 from each class.
-{Classes 1 and 2 narrative} What can you conclude?
A)You are confident that the averages for Class 1 and Class 2 are significantly different.
B)You are confident that the average for Class 1 was 7 to 11 points higher than for Class 2.
C)You are confident that the observed difference found in the two samples (plus or minus the margin of error) will carry over to their respective populations.
D)All of the above.

Question

Quizplus · Accepted Answer

The 95% confidence interval of 9 +/- 2 indicates that we are 95% confident that the true difference in test scores between Class 1 and Class 2 lies within this interval (7 to 11 points), suggesting a significant difference between the two classes. This confidence in the sample-based estimate extends to the population from which the samples were drawn, assuming the samples are representative.

For Questions , Use the Following Narrative