ZuoTi.Pro
Question

A water utility wants to take a sample of residences in a City to estimate the...

A water utility wants to take a sample of residences in a City to estimate the proportion who have reduced their water consumption during the Past year. In the absence of preliminary data, how large a sample must be taken to that a 96% confidence interval will have a margin of error at .02?
math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Given Margin of Error, E 0.02 Confidence level=96% 96% confidence level, z-score, z 2.054 If no preliminary estimate is given, we assume p = 0.5 7L (1-05) 0.02-2.054 * 7L n = 2636.822 2637 Sample need 26

0 0
Add a comment
Know the answer?
Add Answer to:
A water utility wants to take a sample of residences in a City to estimate the...
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Problem 4 (20 pts) A sociologist is interested in surveving workers in computer-related jobs to estimate...

    Problem 4 (20 pts) A sociologist is interested in surveving workers in computer-related jobs to estimate the proportion of such workers who have changed the jobs within the past year. (a) (10 pts) In the absence of preliminary data, how large a sample must be taken to ensure that a 99% confidence interval will specify the proportion to within 20.05? (b) (5 pts) is the sample size obtnined in (a) large enough to ensure that confidence interval will specify the...

  • A large city with chronic economic problems is considering legalizing casino gambling. The city council wants...

    A large city with chronic economic problems is considering legalizing casino gambling. The city council wants to estimate the proportion of all adults in the city who favor legalize casino gambling. This city took a small sample of adults and found 58% favored gambling .What sample size is needed if the margin of error is set to be 3% for a 95% confidence interval?

  • A company wants to test a randomly selected sample of n water specimens and estimate the...

    A company wants to test a randomly selected sample of n water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the company wants a 95% confidence interval estimate with a margin of error of 1.7 milligrams per liter (mg/L), how many water specimens are required in the sample? Assume prior knowledge indicates that pollution readings in water samples taken during a day are approximately normally distributed with a standard deviation equal to 7...

  • Question 19 (5 points) A pollster wants to construct a 95% confidence interval for the proportion...

    Question 19 (5 points) A pollster wants to construct a 95% confidence interval for the proportion of adults who believe that economic conditions are getting better. A Gallup poll taken in July 2010 estimates this proportion to be 0.33. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.039? Write only an integer as your answer. Your Answer: Answer Question 20 (5 points) A researcher wants to construct a...

  • Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour...

    Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour per week. How large a sample should be selected in order to estimate this proportion with a 90% confidence level and a margin of error of at most 5%? (Assume no preliminary estimate of p-hat is available.)

  • b.) A state-wide survey indicates that the proportion is 0.65. Using this estimate, what sample size...

    b.) A state-wide survey indicates that the proportion is 0.65. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.07 2) A researcher wants to construct a 99% confidence interval for the proportion of elementary school students in Seward County who receive free or reduced-price school lunches.

  • Question 9 (1.5 points) A medical researcher wants to construct a 99% confidence interval for the...

    Question 9 (1.5 points) A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result in complications. An article in the Journal of Bone and Joint Surgery suggested that approximately 8% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of o.023 2 Write only an integer as your answer. Your Answer Answet Save Question 10...

  • 1. A prison official wants to estimate the proportion of cases of recidivism. Examining the records...

    1. A prison official wants to estimate the proportion of cases of recidivism. Examining the records of 238 convicts, the official determines that there are 92 cases of recidivism. Find the lower limit of the 90% confidence interval estimate for the population proportion of cases of recidivism. (Round to 3 decimal places.) 2. A prison official wants to estimate the proportion of cases of recidivism. Examining the records of 157 convicts, the official determines that there are 47 cases of...

  • A consumer agency wants to estimate the proportion of all drivers who wear seat belts while...

    A consumer agency wants to estimate the proportion of all drivers who wear seat belts while driving. A preliminary study of 600 people has shown that 436 of drivers wear seat belts while driving. How large should the sample size be so that the 99% confidence interval for the population proportion has a maximum error of .03?

  • 4. During a recent drought, a California water utility sampled 100 residential water bills and found...

    4. During a recent drought, a California water utility sampled 100 residential water bills and found that 83 of the residences had reduced their water consumption over that of the previous year. d) The claim is made that the more than 75% of the residences have reduced their usage. What level of confidence can this statement be made? That is, if ? > 0.75was a lower confidence interval, what would the level 100(1 − ?)% coverage be? e) If a...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT