APFIVE Confidence Interval for a Difference in Means
Researchers testing a new diet calculated a 99% confidence interval for the difference in mean weight loss (new diet - standard diet) of (-1.2, 5.7) pounds. The researchers want to claim the new diet is superior. Which statement best describes what action they should take?
A
Collect more data before making any claims.
B
Reduce confidence level to 95% to narrow the interval.
C
Claim the diets are equivalent.
D
Claim superiority with 99% confidence.
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