Confidence interval for the average price

Question

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Q: The Minneapolis Star Tribune newspaper has decided to write an article about gasoline prices in the Twin Cities area (Minneapolis and St. Paul). The paper has designed a survey and taken a simple random sample of regular, unleaded gas prices at 35 area stations. The results are in the Area Gas Prices -Use this data to develop a 95% confidence interval for the average price of regular, unleaded gasoline in the area.

Area Gas Prices - Random Sample
Station	Minneapolis Price of Regular Unleaded	Station	St. Paul Price of Regular Unleaded
1	$3.24	36	$3.05
2	$3.03	37	$2.89
3	$3.63	38	$3.84
4	$3.58	39	$3.50
5	$2.94	40	$2.78
6	$3.68	41	$3.51
7	$3.14	42	$3.33
8	$3.36	43	$3.31
9	$3.40	44	$3.20
10	$3.20	45	$3.15
11	$2.85	46	$2.75
12	$3.80	47	$3.79
13	$3.31	48	$3.10
14	$3.78	49	$3.92
15	$3.43	50	$3.31
16	$3.27	51	$3.45
17	$3.18	52	$3.17
18	$3.48	53	$3.44
19	$3.00	54	$2.93
20	$3.36	55	$3.21
21	$3.52	56	$3.37
22	$3.26	57	$3.08
23	$3.04	58	$3.04
24	$3.17	59	$3.24
25	$3.26	60	$3.17
26	$3.27	61	$3.36
27	$3.30	62	$3.25
28	$3.51	63	$3.62
29	$3.80	64	$3.88
30	$3.05	65	$3.02
31	$3.56	66	$3.68
32	$3.53	67	$3.29
33	$2.96	68	$2.81
34	$3.57	69	$3.43
35	$3.58	70	$3.44