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1. What is the value of z crit for a 95% confidence interval? 2. From a normally distributed population, a simple random sample of size

1. What is the value of z_critfor a 95% confidence interval?

2. From a normally distributed population, a simple random sample of size 30 is taken. The mean of the sample is 144 and the standard deviation of the sample is 12. Which interval is a 99% confidence interval for the population mean? (143.0,145.0), (138.3,149.7), (143.4,144.6) OR (139.7,148.3)

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