Question

A site had 196 drums of waste stored since 1980. A record of amount chemical stored per drum in 1980 is available. Over 30 years, it is suspected it have undergone some chemical changes resulting in different amounts. So, we are interested in estimating the total amount of that specific chemical stored at this site in 2020. As testing 196 drums is too expensive and time consuming, a random sample of 16 drums was taken and tested to determine the amount of chemical per drum. Results are shown in the table below.

Answer 1

The given information is at Drum slumber In 1980 In 2020 80 76. 138 67 67 29 464 ۱ 459 १२ 172 104 183 106 78 66 86 46 1834 2179 Total to 1 of 196 drums B = Smp = "934 = 114.6385 n 16 y = { y = 2179 = 136.1875 - Total Amount of chemical stored in 1980 = Xtotal = 22,000 1 The ratio estimate of population mean is F = y Ž = 136 1815 x/22,000 | 114: Gar ( 1 ) - (1.1881) X11202448 YR = 113.35

Estimate of total amount of chemical in 2020 YR (Total) = 4 x X total = 1 136. 1875) x 22,000 (1140625) =(1-1881) 822,000 Yo (Total = 26138.2 conclusion: - I Mean estimate of chemical per drum in [2000 is 113.35 and estimate of total amount of chemical in 2000 is 26/38.2