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Edit View History Bookmarks People Window Help Secure https:/ 4783 fa se&cld; 4970063&centerw; Econ321 ONLINE Summer2018 morgan seaks & I ???183:13 PM Homework: CH 9 HW ONLINE Score: 0 of 1 pt 9.2.35 27 of35 (28 complebel HW Score: 71.03%, 24.86 of 35 pts estion Hep * The folliowing data represent the concentration ofl onganic carbon (mo/L.) collected from orpanie sol Orsret a 99% cofdene remval fr te mean concertrason of dssolved oprie carbon collected from orgaic soil(Nce: x-17.0 mgl and s 7.97 gt) ?0.30 29.50 27.10 16.51 15.72 3051 1486 10.30 15.36 1980 1486 2048 140 37 81 146 09 Click the icon to view the table of areas under the 1distribution Construct a99% cofdence interval for the mean oonontton af din akod argarie aaton elected from og no sol (Use ascending order. Round to two decimal places as neaded ) Enter your answer in he edit fields and then Char Al 8 0

Explanation / Answer

solution:-

given mean = 17.0 , standard deviation = 7.97
n = 20 , df = 19  
99% confidence with df = 19 is t = 2.861
confidence interval formula = x +/- t * s / sqrt(n)
=> 17.0 +/- 2.861 * 7.97 / sqrt(20)
=> (11.90 , 22.10)

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