ZuoTi.Pro
Question

University X has 25,000 students. You want to determine, within ±1000 and with 95% confidence, how...

University X has 25,000 students. You want to determine, within ±1000 and with 95% confidence, how many of these 25,000 students purchased books online during 2012. From your experience with other colleges, you know that about 20% of students purchase books online. What sample size do you need?
N =
Z=2 =
NE =
E =

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

0 0
Add a comment
Know the answer?
Add Answer to:
University X has 25,000 students. You want to determine, within ±1000 and with 95% confidence, how...
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

  • You want to estimate the mean IQ for a population of students with a 95% confidence...

    You want to estimate the mean IQ for a population of students with a 95% confidence interval. Assume that the population standard deviation is known to be 15. If you want your estimate to be within 5 points of the value of the parameter, you will need a sample size of... (Round z to the nearest hundredth.)

  • Suppose you want to know what percent of undergraduate students attending at the University of Nebraska...

    Suppose you want to know what percent of undergraduate students attending at the University of Nebraska – Lincoln are from Nebraska. This indicates how UNL attracts students from other states and other part of the world. Can you come up with an estimate (as well as a 95% confidence interval) of the percent of undergraduate students attending at the University of Nebraska – Lincoln are from Nebraska? Describe your approach and results. Tips: you need to randomly sample a group...

  • We want to estimate the mean weekly earnings of students at a particular college with 95% confidence. How many students...

    We want to estimate the mean weekly earnings of students at a particular college with 95% confidence. How many students must be randomly selected so that the sample mean is within $1 of the population mean? Population standard deviation is known to be $10.

  • You want to construct a confidence interval for the mean hours of sleep for all college...

    You want to construct a confidence interval for the mean hours of sleep for all college students and you want to find the appropriate sample size for some constraints outlined below. Assume you know the population standard deviation (σ) is 1.45 hours. (a) Estimate the sample size required to be 95% confident that the sample mean is within 0.2 hours of the population mean for college students. The minimum sample size is ___ students. (b) Estimate the sample size required...

  • If you want to estimate the proportion of all RIT students who smoke within 0.05 with...

    If you want to estimate the proportion of all RIT students who smoke within 0.05 with 90% confidence, what is the minimum sample size you will need? a. 1562 b. 2033 c. 271 d. 549

  • The student affairs office of a public university wishes to study absenteeism among students at the...

    The student affairs office of a public university wishes to study absenteeism among students at the School of Business during the semester. A random sample of 100 business students reveals the following: •Absenteeism: mean = 9.7 classes & standard deviation = 8.0 classes •48 business studentswere absent more than 5 classes a.Construct a 95% confidence interval estimate of the population mean number of absences for business students during the semester. b.Construct a 90% confidence interval estimate of the population proportion...

  • You want to construct a 95% confidence interval for the performance of a large population of...

    You want to construct a 95% confidence interval for the performance of a large population of mutual funds. Assume returns are independent across funds, and the standard deviation of fund returns is 8.1 %. If you want the width of your interval to be 2.4 %, what sample size must you collect? Assume sample is large enough that the sample mean is normally distributed. Enter answer as the smallest integer sample that will accomplish your objective. I need it to...

  • A university dean randomly selected 200 students and found that 102 of them were receiving financial...

    A university dean randomly selected 200 students and found that 102 of them were receiving financial aid. a) Calculate the 80% confidence interval for the true rate of students who receive financial aid. Interpret the result. b) Calculate the 90% confidence interval for the true rate of students who do not receive financial aids. Interpret the result. c) How large a sample size needed with 95% confidence to estimate the true rate of students who receive financial aid within 0.05....

  • a. You wish to compute the 95% confidence interval for the population proportion. How large a...

    a. You wish to compute the 95% confidence interval for the population proportion. How large a sample should you draw to ensure that the sample proportion does not deviate from the population proportion by more than 0.12? No prior estimate for the population proportion is available. Round intermediate calculations to at least 4 decimal places and "z" value to 3 decimal places. Round up your answer to the nearest whole number.)   Sample Size - b. A business student is interested...

  • 1) (15%) For Applied Management Statistics class you want to know how college students feel about...

    1) (15%) For Applied Management Statistics class you want to know how college students feel about the transportation system in Barcelona. a) What is the population in this study? b) What type of sample would you use and why? 2) (25%) A manager of an e-commerce company would like to determine average delivery time of the products. A sample of 25 customers is taken. The average delivery time in the sample was four days. Suppose the delivery times are normally...

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