Construct a 99% confidence interval for the variance (standard deviation) of all voltages in the house. i. Procedure: Select an answer Select an answer One mean Z procedure One variance x² procedure One proportion Z procedure One mean T procedure ii. Assumptions: (select everything that applies) The number of positive and negative responses are both greater than 10 Population standard deviation is unknown O Normal population Simple random sample Population standard deviation is known Sample size is greater than 30 iii. Unknown parameter: Select an answer Select an answer σ², population variance p, population proportion μ, population mean

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