![]() However, because the company only cares about the upper bound, they can calculate a one-sided confidence interval instead. When they calculate a two-sided confidence interval, the upper side of the interval is 18.4. ![]() The fewer dissolved solids they have, the better. Thus, use a one-sided confidence interval to increase the precision of an estimate only when you are worried about the estimate being either greater or less than a cut-off value, but not both.įor example, a beverage company wants to determine that the amount of dissolved solids in their drinking water. A one-sided interval does not provide any information about the parameter in the opposite direction. However, a one-sided interval indicates only whether a parameter is either less than or greater than a cut-off value. A one-sided confidence interval has a smaller margin of error than a two-sided confidence interval.
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