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Suppose the weights of a population of female Bernese mountain dogsare normally distributed with an unknown population mean and a population standard deviation of 0.6

Suppose the weights of a population of female Bernese mountain dogsare normally distributed with an unknown population mean and a population standard deviation of 0.6 pounds. A random sample of Bernese mountain dogsfrom the population produces a sample mean weightof x=89.3 pounds.

What value of z should be used to calculate a confidence interval with a 99% confidence level?

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