1. Find the critical value t_/2 needed to construct a 95% confidence interval. n = 12, s = 2.5, X=15X=15 (Xbar = 15)

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2. Find the critical value t_/2 needed to construct a 80% confidence interval. s = 96 lbs, X=8405lbsX=8405lbs (Xbar = 8405 lbs)

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3. A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 15.32 oz and the sample standard deviation is 0.50 oz, find the 98% confidence interval of the true mean. Assume the distribution to be normal.

The lower limit will be oz. Round to the nearest hundredth (2 decimal places).

The upper limit will be oz. Round to the nearest hundredth (2 decimal places).

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4. The winning team's score in 13 high school basketball games was recorded. If the sample mean is 54.3 points and the sample standard deviation is 16.0 points, find the 99% confidence interval of the true mean. The population is normally distributed.

The lower limit will be oz. Round to the nearest hundredth (2 decimal places).

The upper limit will be oz. Round to the nearest hundredth (2 decimal places).

If the answer cannot be determined, type 123456 in both blanks.