The average GPA for a group of 15 students is 2.95 with a sample standard deviation of 0.5. Find a 99% confidence interval for the mean GPA of the population.

Question 2 options:

(2.6731, 3.2269)

(2.5657, 3.3343)

(2.7226, 3.1774)

(2.5475, 3.3525)

Question

The average GPA for a group of 15 students is 2.95 with a sample standard deviation of 0.5. Find a 99% confidence interval for the mean GPA of the population.

Question 2 options:
	
(2.6731, 3.2269)

	
(2.5657, 3.3343)

	
(2.7226, 3.1774)

	
(2.5475, 3.3525)

anonymous · Answer

@jim_thompson5910 @nikato

nikato · Answer

can you use a calculator, or do you have to do it by hand?

anonymous · Answer

i can use a calculator, I'm just not sure how to set up the problem to solve it.

nikato · Answer

|dw:1459214213448:dw|

remember this formula for finding confidence interval?