Question

In: Math

An industrial plant discharges water into a river. An environmental protection agency has studied the discharged...

An industrial plant discharges water into a river. An environmental protection agency has studied the discharged water and found the lead concentration in the water (in micrograms per litre) has a normal distribution with population standard deviation σ = 0.7 μg/l. The industrial plant claims that the mean value of the lead concentration is 2.0 μg/l. However, the environmental protection agency took 10 water samples and found that the mean is 2.56 μg/l. A hypothesis test is carried out to determine whether the lead concentration population mean is higher than the industrial plant claims. (Use 1% level of significance). An appropriate test for this one population hypothesis problem is to use the _______.

Solutions

Expert Solution

H0: The lead concentration population mean is not higher than the industrial plant

H1: The lead concentration population mean is higher than the industrial plant

Thus we conclude that the lead concentration population mean is higher than the industrial plant

milcah answered 4 months ago
Next > < Previous

Related Solutions

The Environmental Protection Agency has determined that safe drinking water should, on average, contain no more...
The Environmental Protection Agency has determined that safe drinking water should, on average, contain no more than 1.3 mg/liter of copper. You are testing water from a new source, and take 31 water samples. The mean copper content in your samples is 1.46 mg/l and the standard deviation is 0.18 mg/l. (a) Is there convincing evidence at the α = 0.05 significance level that the water from this source contains unsafe levels of copper? (Do a 4-step process) (b) Referring...
Wastewater plant discharges effluent in river from the center. Characteristics of River and wastewater is given...
Wastewater plant discharges effluent in river from the center. Characteristics of River and wastewater is given in Table below. Velocity of River V= 10 cm/s, After intial mix, Dissolved-oxygen concentration C0 = 9.5 mg/L, Saturation Dissolved-oxygen concentration at 15 C Cs= 11 mg/L, Deoxgenation rate at 20 C k1,20 = 0.55 per day, Reoxgenation rate at 20 C k2,200= 0.85 per day Temperature of River Tr=12 C BOD load L0=25 mg/L How long (in days) it takes to reach DO...
The Environmental Protection Agency (EPA) requires that cities monitor over 80 contaminants in their drinking water....
The Environmental Protection Agency (EPA) requires that cities monitor over 80 contaminants in their drinking water. Samples from the Lake Huron Water Treatment Plant gave the results shown here. All observations were below the allowable maximum, as shown by the reported range of contaminant levels. (presumably the mean would be the midrange). Substance    Range Detected    Allowable MAX        Origin of Substance Chromium    0.44 to 0.57             100                            Discharge from steel and pulp mills, natural erosion Barium         0.007 to 0.020          2                               Discharge from...
1) The Environmental Protection Agency was created in 1970 to mount a coordinated attack on environmental...
1) The Environmental Protection Agency was created in 1970 to mount a coordinated attack on environmental problems. Its duties primarily include Multiple Choice providing financial assistance to the private sector to find alternative sources of energy. assisting state and local pollution control efforts. assessing fines against businesses for violating the Environmental Protection Act. drafting agreements between the United States and its trading partners concerning the environmental effects of international trade. 2) The Clean Air Act of 1990 has all but...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd2 content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 69.58 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd2 ) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 91.65 mg sample was taken from the ~ 50 g of dry material and dissolved in...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd2 ) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 91.65 mg sample was taken from the ~ 50 g of dry material and dissolved in...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd2 content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 73.11 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd2 ) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 64.00 mg sample was taken from the ~ 50 g of dry material and dissolved in...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams...
An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd2 ) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 64.00 mg sample was taken from the ~ 50 g of dry material and dissolved in...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT