A statistic course has 21 students in which 81.0% passed

1. A statistic course has 21 students in which 81.0% passed.
At 90% confidence, the lower confidence limit for the proportion students passing with 3 decimal places.
2. A statistic course has 21 student in which 72%. At confidence , the upper confidence limit for the proprion
3. A Sample of 18 widgets has a mean of 47. And standard deviation of 99.550, At 99% confidence, the upper limit with 3 decimal places
4. A sample of 10 widgets has 26.600 and the standard deviations of 7.600. At 90% confidence, the lower limit with decimal places is places
5. As sample size decreases, confidence interval width…….
6. As the confidence level increases, the margin of error……
7. To compute a confidence interval for the mean, population standard deviation unknown, n=35, and a=0.01, enter the critical value