12. Construct a 90% confidence interval to estimate the population standard deviation of Christmas tree heights for a 6-foot Douglas Fur. The height of a 6-foot Douglas Fur follows a normal distribution and a sample of 41 of these trees had a sample standard deviation of 3.3 inches. Answer with 2-digits past the decimal. You do NOT need to find the variance confidence interval but SHOW WORK. <6<

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