Recently, six single-family homes in San Luis Obispo County in California sold at the following prices (in $1,000s): 777, 648, 717, 798, 755, 667. [You may find it useful to reference the t table.] a. Construct the 90% confidence interval for the mean sale price in San Luis Obispo County. (Round intermediate calculations to at least 4 decimal places, "sample mean" and "sample standard deviation" to 2 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) b. What assumption have you made when constructing this confidence interval? multiple choice Single family homes in San Luis Obispo follow a normal distribution. Single family homes in San Luis Obispo need not follow a normal distribution.

You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. each compact fluorescent light bulb costs $4 and saves you an average of $2 per year in energy costs, and each square foot of wall insulation costs $1 and saves you an average of $0.20 per year in energy costs.† your mansion has 150 light fittings and 3000 sq ft of uninsulated exterior wall. to impress your friends, you would like to spend as much as possible, but save no more than $750 per year in energy costs (you are proud of your large utility bills). how many compact fluorescent light bulbs and how many square feet of insulation should you purchase? how much will you save in energy costs per year? (if an answer does not exist, enter dne.)