Question

A researcher claims the mean noise levels at road construction sites in Minnesota are greater than...

A researcher claims the mean noise levels at road construction sites in Minnesota are greater than the mean noise levels at road constructions sites in Iowa. A sample of 25 construction sites in Minnesota had a mean noise level of 85 decibels with a standard deviation of 8 decibels. A sample of 20 constructions sites in Iowa had a mean noise level of 82 decibels with a standard deviation of 7 decibels. Use the five step method to test the researchers claim using α = .05. Assume the distributions of noise levels at road construction sites in both Minnesota and Iowa are approximately normal.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A health inspector was interested in determining if the mean noise levels of road construction sites...
A health inspector was interested in determining if the mean noise levels of road construction sites is less than 90 decibels. To test this, the noise levels at 64 randomly chosen road constructions sites were measured in decibels. The sample mean noise level was 85 decibels, and the population standard deviation is 10 decibels. Use the five step testing method using α = .025 to test the claim that road construction sites have a mean noise level less than 90...
Noise levels at 5 construction sites were measured in decibels yielding the following data: 179,166,143,183,146, Construct...
Noise levels at 5 construction sites were measured in decibels yielding the following data: 179,166,143,183,146, Construct the 99% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 2 of 4: Calculate the sample standard deviation for the given sample data. Round your answer to one decimal place
A health inspector was interested in determining if the noise levels of hospital                   corridors in...
A health inspector was interested in determining if the noise levels of hospital                   corridors in an urban area is greater than 59 decibels. To test this, the noise levels at                   84 randomly chosen hospitals from the urban area were measured in decibels. The                  sample mean noise level was 61.2 decibels, and the population standard deviation is                   7.9 decibels. Use the five step method to test the inspectors claim using α = .025.
Noise levels at 3 volcanoes were measured in decibels yielding the following data: 142,113,135 Construct the...
Noise levels at 3 volcanoes were measured in decibels yielding the following data: 142,113,135 Construct the 90%90% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Copy Data Step 2 of 4: Calculate the sample standard deviation for the given sample data. Round your answer to one decimal place
Noise levels at 5 airports were measured in decibels yielding the following data: 152,154,139,124,120 Construct the...
Noise levels at 5 airports were measured in decibels yielding the following data: 152,154,139,124,120 Construct the 80% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 1 of 4 :   Calculate the sample mean for the given sample data. Round your answer to one decimal place.
Noise levels at 5 concerts were measured in decibels yielding the following data: 142,142,123,133,139 Construct the...
Noise levels at 5 concerts were measured in decibels yielding the following data: 142,142,123,133,139 Construct the 99% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 1 of 4 : Calculate the sample mean for the given sample data. Round your answer to one decimal place.
A researcher claims that the mean of the salaries of elementary school teachers is greater than...
A researcher claims that the mean of the salaries of elementary school teachers is greater than the mean of the salaries of secondary school teachers in a large school district. The mean of the salaries of a random sample of 26 elementary school teachers is $49,099, and the sample standard deviation is $3,839.99. The mean of the salaries of a random sample of 24 secondary school teachers is $45,609. The sample standard deviation is $5,407. At α = 0.05, can...
Noise levels at 6 airports were measured in decibels yielding the following data: 140, 146, 137,...
Noise levels at 6 airports were measured in decibels yielding the following data: 140, 146, 137, 146, 126, 128 Construct the 80% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. (2 pts) Step 1. Calculate the sample mean for the given sample data. Round your answer to one decimal place.             Answer: ____________________ (2 pts) Step 2. Calculate the sample standard deviation for the given sample data. Round your answer to one...
For a sample of 4 operating rooms taken in a hospital study, the mean noise level...
For a sample of 4 operating rooms taken in a hospital study, the mean noise level was 41.4 decibels and the standard deviation was 10.3. Find the 95% confidence interval of the true mean of the noise levels in the operating rooms. Assume the variable is normally distributed. Round your answers to at least two decimal places.
A researcher claims that the mean monthly household income for of Precinct 1 is less than...
A researcher claims that the mean monthly household income for of Precinct 1 is less than Precinct 2 of a particular large city. The following statistics were obtained. Precinct Mean (RM) Standard Deviation (RM) Sample Size 1 4825 1750 17 2 5750 1950 15 Assume normal distributions and equal variances. Test at the 5% significance level.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT