B. A corporation owns a chain of several hundred gasoline stations on the eastern seaboard. The...

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B. A corporation owns a chain of several hundred gasoline stations on the eastern seaboard. The marketing director wants to test a proposed marketing campaign by running ads on some local television stations and deter- mining whether gasoline sales at a sample of the companys stations increase after the advertising. The following data represent gasoline sales for a day before and a day after the advertising campaign. Determine whether sales increased significantly after the advertising campaign. Use an alpha of 0.05. Station Before After 1 10,500 12,600 2 8,870 10,660 3 12,300 11.890 10,510 14.630 5 5,570 8,580 6 9,150 10,115 7 11.980 14.350 8 6,710 6.900 9 7,340 8,890 10 13,400 16.540 11 12,200 11.300 12 10,570 13.330 13 9,880 9.990 14 12.100 14.050 15 9000 9,500 16 11,800 12.450 17 10500 13.450 Step 1: B. A corporation owns a chain of several hundred gasoline stations on the eastern seaboard. The marketing director wants to test a proposed marketing campaign by running ads on some local television stations and deter- mining whether gasoline sales at a sample of the companys stations increase after the advertising. The following data represent gasoline sales for a day before and a day after the advertising campaign. Determine whether sales increased significantly after the advertising campaign. Use an alpha of 0.05. Station Before After 1 10,500 12,600 2 8,870 10,660 3 12,300 11.890 10,510 14.630 5 5,570 8,580 6 9,150 10,115 7 11.980 14.350 8 6,710 6.900 9 7,340 8,890 10 13,400 16.540 11 12,200 11.300 12 10,570 13.330 13 9,880 9.990 14 12.100 14.050 15 9000 9,500 16 11,800 12.450 17 10500 13.450 Step 1: