MATH

posted by .

THE MEAN PRICE OF DIGITAL CAMERAS AT AN ELECTRONIS STOR IS $224, WITH A STANDARD DEVIATION OF $8. RANDOM SAMPLES OF SIZE 36 ARE DRAWN FROM THIS POPULATION AND THE MEAN OF EACH SAMPLE IS DETERMINED.

  • MATH -

    First, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you.

    What is your question?

  • MATH -

    Suppose that the population proportion of Internet users who say that they use Twitter or another service to post updates about themselves or to see updates about others is 19%. Think about selecting random samples from a population in which 19% are Twitter users.

  • STAT -

    1. In a study of the income of U.S. factory workers, a random sample of 100 workers shows a sample mean of $35,000. Assume that the population standard deviation is $4,500, and that the population is normally distributed.

    A) Compute the 90%, 95% and 99% confidence intervals for the unknown population mean.

    B) Briefly discuss what happens to the width of the interval estimate as the confidence level increases. Why does this seem reasonable?

    2. In a study of the starting salary of college graduates with degrees in Accounting, a random sample of 80 graduates shows a sample mean of $36,000 and a sample standard deviation of $2,500. Assume that the population is normally distributed.

    A) Compute and explain a 95% confidence interval estimate of the population mean starting salary for Accounting graduates.



    3. A telephone poll of 950 American adults asked "where would you rather go in your spare time?" One response, by 300 adults, was "a movie". Compute and explain a 95% confidence interval estimate of the proportion of all American adults who would respond "a movie".

  • MATH -

    In a study of the starting salary of college graduates with degrees in Accounting, a random sample of 80 graduates shows a sample mean of $36,000 and a sample standard deviation of $2,500. Assume that the population is normally distributed.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math (Statistic)

    Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling distribution …
  2. statistics

    The scores of students on the ACT college entrance examination in a recent year had a normal distribution with a mean of 18.6 and a standard deviation of 5.9. A simple random sample of 50 students who took the exam is selected for …
  3. statistics

    what are the mean and standard deviation of a sampling distribution consisting of samples of size 16?
  4. Statistics

    he Oil Price Information Center reports the mean price per gallon of regular gasoline is $ 3.79 with a population standard deviation of $ 0.18. Assume a random sample of 40 gasoline stations is selected and their mean cost for regular …
  5. statistics

    How do we compute sample size fluctuations?
  6. sample size/ standard deviations

    How do we compute sample size fluctuations?
  7. Statisitcs

    The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random samples of size 9 are drawn from this population and the mean of each sample is determined. Find that mean and …
  8. Statistics/Probability

    The standard deviation of the masses of articles in a large population is 4.55 kg. Random samples of size 100 are drawn from the population. Find the probability that a sample mean will differ from the population mean by less than …
  9. Statistics

    The following is a histogram (right skewed) of the first ten terms of a geometric distribution with p = .4. The mean of this distribution is 2.5 and the standard deviation is approximately 1.93. What's the shape of the distribution …
  10. Statisix

    The mean price of photo printers on a website is ​$241 with a standard deviation of ​$60. Random samples of size 30 are drawn from this population and the mean of each sample is determined.

More Similar Questions