The world of tennis is currently in its golden age as more of the game's greatest all-time players have played over the last 15 years versus any other era in tennis. For example, a random sample of 25 matches of Federer vs. Rafael had a sample mean TV rating of 21.3. (Aside: this is a higher rating than any Patriots game ever played. Assume the distribution is normally distributed with a population standard deviation of 2.5. Which of the below is the closest approximation to a 95% confidence interval for the sample mean? Notice how the answer changes from previous question as n increases.
1) [20.26, 22.33]
2) [20.32, 22.28]
3) [20.48, 22.12]
4) [20.44, 22,16]