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Find the z scores that separate the middle

Find the z scores that separate the middle 48% of the distribution from the area in the tails of the standard normal distribution

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## Q : Confidence interval for the target parameter

In exercise 2.100a, you computed the interval, mean ± 2s. Explain why this formula should not be used as an interval estimate for the target parameter. Calculate a 90% confidence interval for the target parameter. Interpret the result.