Question: Find the 95% confidence interval for the variance and standard deviation of the nicotine content of cigarettes manufactured if a random sample of 20 cigarettes

Find the 95% confidence interval for the variance and standard deviation of the nicotine content of cigarettes manufactured if a random sample of 20 cigarettes has a standard deviation of 1.6 milligrams. Assume the variable is normally distributed. a. Find the critical value b. Find the confidence interval for the true population variance c. Find the confidence interval for the true population standard deviation d. Write the conclusion in a full statement

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