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Annual family medical expenses for all families in US has normal distribution. 95% confidence interval estimates of annual family medical expenses from a random Sample

Annual family medical expenses for all families in US has normal distribution.

95% confidence interval estimates of annual family medical expenses from a random

Sample of 400 families are ($1000, $1196). The Population Standard Deviation used to

calculate confidence interval estimate is:

a. $1000

b. $1098

c. $196

d. $50

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