Mathematics, 10.02.2020 21:52, kiki2332
The Department of Natural Resources (DNR) received a complaint from recreational fishermen that a community was releasing sewage into the river where they fished. These types of releases lower the level of dissolved oxygen in the river and hence cause damage to the fish residing in the river. An inspector from the DNR designs a study to investigate the fishermen’s claim. Fifteen water samples are selected downstream from the community. The dissolved oxygen readings in parts per million (ppm) are given in the following table.
Upstream: 5.2; 4.8; 5.1; 5.0; 4.9; 4.8; 5.0; 4.7; 4.7; 5.0; 4.6; 5.2; 5.0; 4.9; 4.7
Downstream: 3.2; 3.4; 3.7; 3.9; 3.6; 3.8; 3.9; 3.6; 4.1; 3.3; 4.5; 3.7; 3.9; 3.8; 3.7
a. In order for the discharge to have an impact on fish health, there needs to be at least an .5ppm reduction in the dissolved oxygen. Do the data provide sufficient evidence that there is a large enough reduction in the mean dissolved oxygen between the upstream and downstream water in the river to impact the health of the fish? Use a = .01.
b. Do the required conditions to use the test in part (a) appear to be valid?
c. What is the level of significance of the test in part (a)?
d. Estimate the size of the difference in the mean dissolved oxygen readings for the two locations on the river using a 99% confidence interval.
Please do this in excel or R.
Answers: 2
Mathematics, 21.06.2019 18:00, cexe2630
The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old
Answers: 1
Mathematics, 22.06.2019 00:00, broooooo4991
Alice is paying her bill at a restaurant. but tax on the cost of a male is 5%. she decides to leave a tip 20% of the cost of the meal plus the tax
Answers: 3
The Department of Natural Resources (DNR) received a complaint from recreational fishermen that a co...
History, 27.03.2021 01:00
Mathematics, 27.03.2021 01:00
Mathematics, 27.03.2021 01:00
French, 27.03.2021 01:00
History, 27.03.2021 01:00
Mathematics, 27.03.2021 01:00
Physics, 27.03.2021 01:00
Mathematics, 27.03.2021 01:00