APFIVE Confidence Interval for a Difference in Means
Researchers calculated a 99 percent confidence interval for the difference in mean weight loss (new diet minus standard diet) as (–1.2, 5.7) pounds. The researchers wish to claim that the new diet is superior. Based on this interval, which course of action is most appropriate?
A
Claim the diets are equivalent.
B
Reduce confidence level to 95% to narrow the interval.
C
Claim superiority with 99% confidence.
D
Collect more data before making any claims.
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