Homework Help: Statistics

Posted by Walter on Wednesday, April 4, 2012 at 5:15pm.

Waste Today Services operates a garbage hauling company in a South Jersey city. Each year, the company must apply for a new contract with the city. The contract is in part based on the pounds of garbage hauled. Part of the analysis that goes into the contract development is an estimate of the mean pound of garbage put out by each customer in the city. The city has asked for both 99% and 90% confidence interval estimates for the mean. A sample of 100 customers was taken. It is known that the population standard deviation is 12.6 pounds and the sample mean is 40.78. What is the impact in changing the confidence level?

Statistics - MathGuru, Wednesday, April 4, 2012 at 7:39pm
Use confidence interval formulas:

CI99 = mean ą (2.58)(sd/√n)
...where mean = 40.78; 2.58 represents 99% interval; sd = 12.6; n = 100.

Calculate the interval.

Use the formula again for a 90% confidence interval using the appropriate value from a z-table.

Once you calculate both intervals, you should be able to see the difference.

I hope this will help get you started.

Answer this Question

Related Questions

statistics - Waste Today Services operates a garbage hauling company in a South ...
economics - Explain the effect on a company’s stock price today of the ...
operations management - Best Wheels Bicycle Company is looking to automate ...
Statistics - A life insurance company sells a term insurance policy to a 21-year...
math - company A:1/5 company B:4/25 company C:2/5 company D:3/20 how much more ...
math - company A:1/5 company B:4/25 company C:2/5 company D:3/20 Question:What ...
math - company A:1/5 company B:4/25 company C:2/5 company D:3/20 How much ...
Principles of Business - Identify and discuss THREE features which could be used...
m/c - A researcher is hired by a company to ascertain the morale of company ...
math b50 - must answered in sequences/series formulas If the profit earned by a ...

For Further Reading

First Name:
School Subject:
Answer: