The proper operation of typical home appliances requires voltage levels that do not vary much. Listed below are 11 voltage levels (in volts) at a random house on 11 different days. 119.7 119.7 120.2 120.1 120.2 120.1 120.2 120 119.9 119.7 120.1 The mean of the data set is 119.99; the sample standard deviation is 0.207; if the normality plot is not provided you may assume that the voltages are normally distributed. Construct a 99% confidence interval for the variance (standard deviation) of all voltages in the house. Procedure: Assumptions: (select everything that applies) Population standard deviation is known Normal population Sample size is greater than 30 Population standard deviation is unknown Simple random sample The number of positive and negative responses are both greater than 10 Unknown parameter:

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