Question

An economist wants to estimate the mean per capita income (in thousands of dollars) for a...

An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. Suppose that the mean income is found to be $21.8 for a random sample of 1691 people. Assume the population standard deviation is known to be $9.8. Construct the 99% confidence interval for the mean per capita income in thousands of dollars. Round your answers to one decimal place

Homework Answers

Answer #1

Sample size = n = 1691

Sample mean = = 21.8

Population standard deviation = = 9.8

We have to construct 99% confidenc interval for the population mean.

Here population standard deviation is known so we have to use one sample z-confidence interval.

z confidence interval

Here E is a margin of error

Zc = 2.58    ( Using z table)

So confidence interval is ( 21.8 - 0.6149 , 21.8 + 0.6149) = > ( 21.2 , 22.4)

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
An economist wants to estimate the mean per capita income (in thousands of dollars) for a...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. Suppose that the mean income is found to be $32.6 for a random sample of 459 people. Assume the population standard deviation is known to be $9.3 . Construct the 80% confidence interval for the mean per capita income in thousands of dollars. Round your answers to one decimal place.
An economist wants to estimate the mean per capital income (in thousands of dollars) for a...
An economist wants to estimate the mean per capital income (in thousands of dollars) for a major city in Texas. Suppose that the mean income is found to be $29.3 for a random sample of 5749 people. Assume the population standard deviation is known to be $10.7. Construct the 99% confidence interval for the mean per capital income in thousands of dollars. Round your answers to one decimal place.
7. An economist wants to estimate the mean per capita income (in thousands of dollars) for...
7. An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. Suppose that the mean income is found to be $25.8 for a random sample of 2323 people. Assume the population standard deviation is known to be $9. Construct the 98% confidence interval for the mean per capita income in thousands of dollars. Round your answers to one decimal place. Lower endpoint: Upper endpoint: 8. Consider the value of t...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that the mean income is $21.9, and the variance is known to be $31.36. How large of a sample would be required in order to estimate the mean per capita income at the 90% level of confidence with an error of at most $0.26? Round your answer up to the next integer.
An economist wants to estimate the mean per capita income (in thousands of dollars) for a...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. He believes that the mean income is $21.3, and the variance is known to be $32.49. How large of a sample would be required in order to estimate the mean per capita income at the 99% level of confidence with an error of at most $0.39? Round your answer up to the next integer.
An economist wants to estimate the mean per capita income (in thousands of dollars) for a...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. He believes that the mean income is $20, and the variance is known to be $123.21. How large of a sample would be required in order to estimate the mean per capita income at the 99% level of confidence with an error of at most $0.56? Round your answer up to the next integer.
An economist wants to estimate the mean per capita income (in thousands of dollars) for a...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that the mean income is $31.3$⁢31.3, and the standard deviation is known to be $9.4$⁢9.4. How large of a sample would be required in order to estimate the mean per capita income at the 85%85% level of confidence with an error of at most $0.46$⁢0.46? Round your answer up to the next integer.
An economist wants to estimate the mean per capita income (in thousands of dollars) for a...
An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. He believes that the mean income is $21.3, and the variance is known to be 33.91. How large of a sample would be required in order to estimate the mean per capita income at the 80% level of confidence with an error of at most $0.5? Round your answer up to the next integer.
Suppose the mean income of firms in the industry for a year is 85 million dollars...
Suppose the mean income of firms in the industry for a year is 85 million dollars with a standard deviation of 15 million dollars. If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than 107 million dollars? Round your answer to four decimal places. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. Suppose that the mean...
A publisher wants to estimate the mean length of time​ (in minutes) all adults spend reading...
A publisher wants to estimate the mean length of time​ (in minutes) all adults spend reading newspapers. To determine this​ estimate, the publisher takes a random sample of 15 people and obtains the results below. From past​ studies, the publisher assumes sigmaσ is 2.22.2 minutes and that the population of times is normally distributed. 99 88 99 1111 66 99 99 77 1212 77 1212 66 99 1212 99 Construct the​ 90% and​ 99% confidence intervals for the population mean....
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT