AAB Molecular Diagnostics Practice Exam

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A 95% confidence interval for the difference in two process means is -0.8 to 2.4. At approximately the 0.05 significance level, what is the best conclusion about a two-sided test of no difference?

Conclude the first mean is definitely larger Conclude both processes are identical in every respect Fail to reject no difference because the interval includes zero Reject no difference because the interval is wide

Correct Answer:

Fail to reject no difference because the interval includes zero

Explanation:

Because the 95% confidence interval includes zero, a two-sided test at about α = 0.05 would not show a statistically significant difference in the means.

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