Let's say I randomly sample 35 students who have taken statistics with me and find their average course grade in statistics to be 80% with a standard deviation of 7.2%.

Based on these 35 students, I want to make a good guess at what the average course grade is for all of my Statistics students this year (nearly 200).

I find the 90% confidence interval to be 78% to 82%

This means:

Group of answer choices

I feel 80% confident that the mean course grade for all of my Statistics students this year will be between a 78% to 82%

I feel 90% confident that most of my Statistics students this year will be have a course grade between 78% and 82%

I feel 80% confident that most of my Statistics students this year will be have a course grade between 78% and 82%

90% of all my Statistics students this year will have a course grade between 78% and 82%

I feel 90% confident that the mean course grade for all of my Statistics students this year will be between a 78% to 82%.

80% of all my Statistics students this year will have a course grade between 78% and 82%