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?

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	6.8150.565
Days over 12 g/m3	8
Levels of Health Concerns	# of days 2003	# of days 2018
Good	40	108
Moderate	66	8
Unhealthy For Sensitive Groups	4	0
Unhealthy	0	0
Very Unhealthy	0	0
Hazadous	0	0