Statistics

A study was conducted in order to estimate u, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults give a mean weekly computer usage time of 8.5 hours and that from prior studies , the population standard deviation is assumed to be 3.6 hours.

  1. 0
  2. 0
  3. 74
asked by Pat
  1. Are you looking for the confidence interval?

    What level of significance are you using?

    95% = mean ± 1.96 SEm

    SEm = SD/√n

    1. 0
    2. 0
    posted by PsyDAG
  2. n a planned study, there is a known population with a normal disrubution, \mu= 0, and \sigma=10. What is the predicted effect size (d) if the researchers predict that those given an experimental treatment have a mean of (a) -8, (b) -5, (c) -2, (d) 0, and (e) 10 ? For each part, also indicate wether the effect is approximatley small, medium, or large.

    1. 0
    2. 0
    posted by cnm

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from

    asked by avery on June 26, 2013
  2. statistics

    A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from

    asked by avery on June 26, 2013
  3. statistics

    A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from

    asked by avery on June 26, 2013
  4. statistics

    A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from

    asked by avery on June 26, 2013
  5. algebra college level

    it says y=-16x+181 represents number of students in class where x represents number of hours study required weekly. what is rate of change of number of students in class to number of hours study

    asked by azima on April 24, 2012
  6. statistics

    The weekly study times for all students in a school are normally distributed with μ = 18 hours and σ = 6 hours. If 36 students are randomly selected, find the probability that their mean study time is greater than 20 hours. My

    asked by Judy on September 15, 2016
  7. maths

    A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125. Determine with 99% confidence the number of families that must be sampled

    asked by sarah on January 16, 2013
  8. math

    the least common multiple of 3, 6,9 i say 18 Sheila practiced hours Monday, hours Tuesday, and hours Wednesday. What is the total number of hours that she practiced? A) hours B) hours C) hours D) 6 hours Complete the statement,

    asked by dawn on June 27, 2008
  9. Statistics & Probability

    A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard

    asked by Alia on January 11, 2013
  10. Statistics & Probability

    A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard

    asked by Alia on January 11, 2013

More Similar Questions