1. With standards getting stricter over time, it is possible that even if it the current standard is not contained in the confidence interval a future stricter standard might be. What concerns might you have if this were contained in your confidence interval? What can you interpret from this?

2. How to find "method 2"? confidence intervals may be reported in two different ways. Please give your results in both formats. Which format do you find to be more useful or clearer?

One sample T confidence interval:
: Mean of variable
90% confidence interval results:
Variable	Sample Mean	Std. Err.	DF	L. Limit	U. Limit
Daily Mean PM2.5 Concentration 2018	6.8146552	0.33924525	115	6.2521147	7.3771957
2018 PM.2 data confidence interval	(6.25,7.38)
Method 1	(6.25,7.38)
Method 2	?