- Confidence Intervals I need to determine a 95% confidence interval for the mean age and the proportion of males in the population of all online college students.

For the average age, form a 95% confidence interval:

oWhat distribution should be used?

oWhat is the critical value?

oWhat is the error bound?

oWhat is the lower bound?

oWhat is the upper bound?

For the proportion of males, form a 95% confidence interval:

oWhat distribution should be used?

oWhat is the critical value?

oWhat is the error bound?

oWhat is the lower bound?

oWhat is the upper bound?

I am including my Excel Spreadsheet, which I have tried to complete. There are 93 students, and 40 male students in the class.

Points |95% Confidence Interval for Average Age of Online College Students: Sample Mean: 31. 12 Sample St. Dev: 10.23 Sample Size: 93 2 Distribution: T-Distribution 2 Critical Value: 0.05 2 decimals Margin of Error: 2.09 2 decimals Calculation (10.23/93)=2.09 Lower Bound: 29.04 2 decimals Calculation 31.12-2.09=29.03 Upper Bound: 33.2 2 decimals Calculation 31.12+2.09=33.21 2 Interpret 35% Confidence Interval for Proportion of Male Online College Students: Sample Size: 93 Number of Males: 40 N Male Proportion: Female Proportion 4 decimals 2 Distribution: T-Distribution 2 Critical Value: 0.05 2 decimals Margin of Error: 4 decimals Calculation Lower Bound: `4 decimal: Calculation Upper Bound: *4 decimals Calculation Internet