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In a survey of 53 randomly selected patrons of a shopping mall, the mean amount of currency carried is $42 with a standard deviation of $78. What is the 95% confidence interval for the mean amount of currency carried by mall patrons?
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Mean, µ = 42
Standard deviation, σ = 78
95% confidence interval = [µ-2*σ, µ+2*σ]
=[ 42-2*78,42+2*78] = [-114,198].

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