Question

1. What sample size is needed to give a margin of error within ±2.5 in estimating a population mean with 95% confidence, assuming a previous sample had s=2.9.Round your answer up to the nearest integer.
sample size=?

2. Assume the sample is a random sample from a distribution that is reasonably normally distributed and we are doing inference for a sample mean. Find endpoints of a t-distribution with 5% beyond them in each tail if the sample has size n=11. Round your answer to three decimal places.
endpoints  = ± ?

Answer 1

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