A survey for a campus publication asked students to indicate how happy they are with the Blackboard software. They were asked to choose a number between 1 and 10, where 1 = very unhappy and 10 = very happy. 26 students responded. The mean score was 6.2 and the standard deviation was 3.0.

Calculate a 95% confidence interval around our estimate of student's satisfaction with Blackboard.

Now assume that you expanded the survey to a total of 91 respondents. The mean score was 6.4 and the standard deviation was 2.9. Calculate the 95% CI.