A sewage treatment plant located along a river reported a chemical spill which may have released...

A sewage treatment plant located along a river reported a chemical spill which may have released mercury into the river. The local environmental regulatory agency requires that such spills be monitored, and any spill that results in a long term mercury level above 2.5 µg/L (micrograms per litre) requires the party at fault to pay a large fee. A random sample of 58 measurements showed a mercury reading near the treatment plant to have a sample mean of 2.7 µg/L with a sample standard deviation of 0.89 µg/L. To decide if they should pay the fee, the treatment plant performs a hypothesis test.

(a) [2 marks] Define the parameter of interest using the correct notation. Then, state the null and alternative hypotheses for this study.

(b) [1 mark] Calculate the observed value of the test statistic. State the distribution (and degrees of freedom if needed) it follows.

(c) [1 mark] Compute the p-value or provide a range of appropriate values for the p-value.

(e) [1 mark] Using the significance level α = 0.025, state your conclusions about if the treatment plant will pay the fee.

(f) [1 mark] Using the specifics of this question (but not necessarily your conclusion from part (d)), describe what would happen if a Type I error is made.

(d) [1 mark] Using your p-value, state the strengh of evidence against H0.

Expert Solution

orchestra answered 2 years ago

Research indicates that chemical industries located along a river discharge highly toxic effluents into the river...

Research indicates that chemical industries located along a river discharge highly toxic effluents into the river in your country. This pollutes the river water and contaminates fisheries resources for which the industries do not compensate for the reduced quality of the river water and fisheries losses. If you are a high-ranking government official with an expertise in environmental economics, what different methods will you consider to apply to address the issue? Give an international example to show that the effluents...

Q4. You are working in a waste water treatment plant, once your treatment plant receives sewage...

Q4. You are working in a waste water treatment plant, once your treatment plant receives sewage water with more colloidal or dissolved organic materials. As an Engineer what type of treatment will you prefer for this sewage water? Justify and explain the method selected by you.

A pump is required for a sewage treatment plant in a municipality. Three options are under...

A pump is required for a sewage treatment plant in a municipality. Three options are under consideration. Applying an interest rate of 7.5%, the pump options data shown below, and the most computationally efficient appropriate engineering economic measure that can be used to compare the cost of the pump options, answer the questions that follow. Option Cost A B C Purchase Cost 56,000 26,000 20,000 First Year Operating Cost 8,000 10,500 11,500 Operating Cost Increase per Period 500 1000 1400...

A plant along the river accidentally spilled 5 × 105 Bq of 137Cs into the river....

A plant along the river accidentally spilled 5 × 105 Bq of 137Cs into the river. Average river width, depth, and velocity are 40 m, 5 m, and 3 m s?1, respectively. The longitudinal dispersion coefficient of the river is estimated to be 200 m2 s?1. A nearby city uses the river for drinking water and has its water intake station 5 km downstream from the plant. Assuming that 137Cs will be fully mixed across the river cross section by...

Q. (a) What is the significance of different Stages of Sewage Treatment Processes? As a Plant Manager,...

Q. (a) What is the significance of different Stages of Sewage Treatment Processes? As a Plant Manager, what factors you would consider important in decision making regarding selection of any or more of these Stages? (b) What criteria are used in checking Process Efficiency of an Activated Sludge Process? Explain your understanding of SVI Index.

A steel mill located along a river. Its production pollutes the river and damages some fishermen...

A steel mill located along a river. Its production pollutes the river and damages some fishermen downstream. i. Draw a graph of the market for steel that illustrates this situation ii. Discuss two solutions with the help of your graph

Suggest possible ways to significantly reduce the size of a common secondary sewage treatment plant (e.g....

Suggest possible ways to significantly reduce the size of a common secondary sewage treatment plant (e.g. Shatin Sewage Treatment Plant) without lowering the treatment performance.

Which wastewater treatment process is responsible for the removal of most of the BOD in sewage?

A chemical plant produces an ammonia-rich waste gas that cannot be released as-is into the environment....

A chemical plant produces an ammonia-rich waste gas that cannot be released as-is into the environment. One method to reduce the ammonia concentration in the waste gas is to bubble the waste gas through a liquid solvent. Components of the gas that are highly soluble, like ammonia, will dissolve into the liquid phase. Water is an appropriate liquid solvent for this process. The chemical plant produces 125.0 m3/hr of waste gas (ρ = 0.0407 mol/L) initially having a mole fraction...

The port of South Louisiana, located along 54 miles of the Mississippi River between New Orleans...

The port of South Louisiana, located along 54 miles of the Mississippi River between New Orleans and Baton Rouge, is the largest bulk cargo port in the world. The U.S. Army Corps of Engineers reports that the port handles a mean of 4.5 million tons of cargo per week.† Assume that the number of tons of cargo handled per week is normally distributed with a standard deviation of 0.89 million tons. (a) What is the probability that the port handles...

Question