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The average monthly living cost of a family of three in a city in BC is reported to be $3250. Randomly chosen 32 families are

The average monthly living cost of a family of three in a city in BC is reported to be $3250. Randomly chosen 32 families are taken as a sample, which has a mean of $3380 and a standard deviation of $550

Construct a 99% con dence interval for the population standard deviation.

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