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1. Given a random sample of size 23 from a normally distributed population with unknown variance, find the needed to calculate a 98% confidence interval

1. Given a random sample of size 23 from a normally distributed population with unknown variance, find the needed to calculate a 98% confidence interval for the population mean.

2.Given a random sample of size 19 from a normally distributed population, find the quantiles needed to calculate a 90% confidence interval for the population variance.

3.Given a random sample of size 48 from a normally distributed population with unknown variance, find the quantiles needed to calculate a 96% confidence interval for the population mean.

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