Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

StClowers Group Title

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the data to construct a 90% confidence interval estimate of µ, the mean duration of game play. 4049 3881 3854 4030 4324 4816 4661 4040 5001 4821 4327 4326 What is the confidence interval estimate of the population mean µ ? __ < µ < __ (round to one decimal place as needed)

  • 8 months ago
  • 8 months ago

  • This Question is Closed
  1. douglaswinslowcooper Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Get the mean, mu = sum of values divided by number of values, n Get the variance = sum (value-mean)^2/(n-1) get the standard deviation s.d. = sqrt(variance) Get the standard error of the mean from s.e. = s.d./sqrt(n) Assume a normal (Gaussian) distribution approximately for means. Check table of Gaussian distribuiotn to find how many +- s.e. you need to include 90% of the values. For example +- 2 s.e includes 95% of values. Interpretation: means are more nearly Gaussian than underlying distributions from which they come, and 90% of the true means would be expected to lie within +- k s.d. of the sample mean, if only random error.

    • 8 months ago
  2. StClowers Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    huh? I have no clue what you mean. lol

    • 8 months ago
  3. StClowers Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I need help pluggin in the numbers

    • 8 months ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.