Mathematics, 14.07.2020 01:01, corbeansbrain
The Water Department checks the city water supply on a regular basis for
contaminants such as trihalomethanes (THMS). The Water Department takes
200 samples and estimates that the concentration of THMs in your drinking
water is 3 ppb (parts per billion), with a standard deviation of 0.3 ppb.
Assuming the samples were random and unbiased, how much confidence
can you have in this data?
A. 95% confident the average concentration of PCBs in the water
supply is between 2.4 ppb and 3.6 ppb.
B. 99.7% confident the average concentration of PCBs in the water
supply is between 2.7 ppb and 3.3 ppb.
C. 68% confident the average concentration of PCBs in the water
supply is between 2.9 ppb and 3.1 ppb.
D. 97% confident the average concentration of PCBs in the water
supply is between 2.6 ppb and 3.8 ppb.
Answers: 2
Mathematics, 21.06.2019 21:00, ImmortalEnigmaYT
Sue's average score for three bowling games was 162. in the second game, sue scored 10 less than in the first game. in the third game, she scored 13 less than in the second game. what was her score in the first game?
Answers: 2
Mathematics, 21.06.2019 22:30, DatBoiCedd
Convert (-3,0) to polar form. a. (3,0β) b. (-3,180β) c. (3,180β) d. (3,360β)
Answers: 1
The Water Department checks the city water supply on a regular basis for
contaminants such as triha...
Mathematics, 25.05.2020 11:57
Geography, 25.05.2020 11:57
Mathematics, 25.05.2020 11:57
History, 25.05.2020 11:57
Physics, 25.05.2020 11:57