The proper operation of typical home appliances requires voltage levels that do not vary much. Listed below are 27 volta

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answerhappygod
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The proper operation of typical home appliances requires voltage levels that do not vary much. Listed below are 27 volta

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The proper operation of typical home appliances requires voltage
levels that do not vary much. Listed below are 27 voltage levels
(in volts) at a random house on 27 different days.
The mean of the data set is 120; the sample standard deviation
is 0.15; if the normality plot is not provided you may assume that
the voltages are normally distributed.
Construct a 90% confidence interval for the variance of all
voltages in the house.
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