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1: [8 pts] Short answers a. If the standard error of the mean is 70 for n = 50, what must the sample size be

1: [8 pts] Short answers a. If the standard error of the mean is 70 for n = 50, what must the sample size be to reduce the standard error to 50? b. What is the proportion of the area below z = 1 assuming z follows a standard normal distribution

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