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suppose the age that children learn to walk is normally distributed with a population standard deviation of 1.1 months. a random sample of children had

suppose the age that children learn to walk is normally distributed with a population standard deviation of 1.1 months. a random sample of children had a sample mean of 21.5 months. use a calculator to find the value of z that should be used to calculate a confidence intervalvwith an 85% confidence level

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