A confidence interval addresses this issue because it provides a range of values which is likely to contain the population parameter of interest. Confidence levels. Confidence intervals are constructed at a confidence level, such as 95 %, selected by the user.
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Weight Watchers. Weight Watchers International is an American company that offers various products and services to assist weight loss and maintenance. Founded in 1963 by Queens, New York, homemaker Jean Nidetch, it now[update] operates in about 30 countries around the world, generally under names that are local translations of âWeight Watchersâ.