The following values are drawn from a normal population. (You may find it useful to reference the appropriate table chi-sqvareable or E table) 20 20 26 231 35 33 19 35 Click here for the Excel Data Fle a. Calculate the point estimates for the populetion variance and the population standard deviation (Round your answers to 4 decimal places.) Point Estimates Population variance Population standard devation b. Construct the 90% confidence interval for the populetion varlance and the population standard deviation (Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal places) Confidence Interval Population variance Populetion standerd deviation

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