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1)

1)If the margin of error for the population mean for 99% Confidence Level is 39, what was the Standard error of the sample mean?

2)If the margin of error for the population mean for 99% Confidence Level is 39, what was the population standard deviation if the sample size selected was 50?

3)If the sample mean is 70 and standard error of the sample mean is 8, what will be the 90% Confidence Interval assuming Normal Distribution? The sample size was 30.

4)If the sample mean is 70 and standard error of the sample mean is 8, what will be the 90% Confidence Interval assuming T-Distribution? The sample size was 30.

5)If n = 220, p-hat = .4, then what will be the 87.4% Confidence Interval for the population proportion?

6)A coffee machine is designed not to put more than 8 oz in a coffee cup 5% of the times. If the std dev of the filling machine is .3 oz, what should be the machine set so that not to exceed 8 oz?