1. How to find "method 2"? confidence intervals may be reported in two different ways.Which format do you find to be more useful or clearer?

Daily Mean PM2.5 Concentration 2018		<
8.4
3.7
10.7
12
3
9.4
8.7
5.5		One sample T confidence interval:
7
6.6		: Mean of variable
8.4
4.2		90% confidence interval results:
10.1		Variable	Sample Mean	Std. Err.	DF	L. Limit	U. Limit
7.7		Daily Mean PM2.5 Concentration 2018	6.8146552	0.33924525	115	6.2521147	7.3771957
6.7
5.7		2018 PM.2 data confidence interval	(6.25,7.38)
7		^
3.5		Method 1	(6.25,7.38)
10.4		"Method 2 "	?
6.6
3.1
3.3
5.6
4
7.1
4.1
3.7
3.1
7.8
8.3
3.2
3
8.5
14.1
2.4
2.1
7.4
4.4
4.3
11.2
4.4
6.5
5.9
5.1
5.5
4.9
7.5
15
8.8
20.5
3.1
7.3
6.4
7.1
5.7
4.2
7.4
18.4
11.7
4.2
10.9
10.8
14.2
4.5
7.2
5.4
9.4
6.4
6.3
16.7
8.8
6.3
11.9
4.4
9.4
16.5
9.5
6.7
10.1
5.4
4.8
3.8
6.7
1.2
3
5.7
5
7.3
4.7
6.4
4.6
8.1
6.5
4.9
4
10.7
4
4.2
4.9
2.3
3.9
15.2
1.7
3.8
1.3
8.9
2.8
4
9.2
6.5
3.8
9
4.7
2.7
4.7
9.1