In a research study the estimate of variable X is found to be 12.8, with a confidence interval of 10.8 and 14.8. A second estimate of variable X, using a different sample, was 14.2, with a confidence interval of 11.2 and 17.2. What can we say about the difference in the two estimates, if both had valid p values? Choose the best answer.
A) Difference is not significant.
B) Difference is statistically significant.
C) Any difference cannot be determined.
D) There is minimal difference.

Question

Quizplus · Accepted Answer

The confidence intervals of the two estimates overlap (10.8 to 14.8 and 11.2 to 17.2), suggesting that the difference between the two estimates is not statistically significant. Overlapping confidence intervals indicate that the true values of the estimates could be very close or the same, hence not significantly different.

In a Research Study the Estimate of Variable X Is