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The average lifetime of a light bulb is 3,000 hours with a standard deviation of 696 hours. A simple random sample of 36 bulbs is taken. Show the steps you've used to obtain these answers. a. What are the expected value, standard deviation, and shape of the sampling distribution of x ? b. What...

Below you are given ages that were obtained by taking a random sample of 9 undergraduate students. Assume the population has a normal distribution. 19 22 23 19 21 22 19 23 21 a. What is the point estimate of μ? b. Construct a 99% confidence interval for the average age of undergraduate...