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a) If a sample of SAT scores for 20 student has a score mean of 500...

a) If a sample of SAT scores for 20 student has a score mean of 500 with a standard deviation of 48. What is the 99% Confidence interval for the true mean? b) The birth weights in a population are normally distributed with a standard deviation of 13 oz. If sample of 25 was taken and its mean was 105, what is the 95% Confidence interval lower bound for the true mean?

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