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A laboratory is interested in how many times they can use a specific brand of test...

A laboratory is interested in how many times they can use a specific brand of test tube on a Bunsen burner before it cracks. Assume that the population is normally distributed. They test 20 test tubes and finding it took reheating them 1111 times until they cracked, with a standard deviation of 234. Compute the 98% confidence interval to estimate the average number of times they can use the tube. You DO need to check CLT here

Math   Statistics-And-Probability   
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