Statistics

posted by .

A population has a mean of   30 and a standard
deviation of   5.
a. If 5 points were added to every score in the
population, what would be the new values for the
mean and standard deviation?
b. If every score in the population were multiplied by
3 what would be the new values for the mean and
standard deviation?

  • Statistics -

    a. mean = 35; standard deviation of 5 stays the same.

    b. mean = 90; standard deviation = 15

  • Statistics -

    A distribution has a standard deviation of   12.
    Find the z-score for each of the following locations
    in the distribution.
    a. Above the mean by 3 points.
    b. Above the mean by 12 points.
    c. Below the mean by 24 points.
    d. Below the mean by 18 points.


    For the following population of N  6 scores:
    3, 1, 4, 3, 3, 4
    a. Sketch a histogram showing the population
    distribution.
    b. Locate the value of the population mean in your
    sketch, and make an estimate of the standard
    deviation (as done in Example 4.2).
    c. Compute SS, variance, and standard deviation for
    the population. (How well does your estimate
    compare with the actual value of ?)


    In a population of exam scores, a score of X  48
    corresponds to z1.00 and a score of X  36
    corresponds to z  –0.50. Find the mean and standard
    deviation for the population. (Hint: Sketch the
    distribution and locate the two scores on your sketch.)


    A sample consists of the following n  6 scores: 2, 7,
    4, 6, 4, and 7.
    a. Compute the mean and standard deviation for the
    sample.
    b. Find the z-score for each score in the sample.
    c. Transform the original sample into a new sample
    with a mean of M  50 and s  10.

  • Statistics -

    bb

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

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

    a population of score has u=50 and standard devidation =10 if every score in the population is multipied by 2 the new mean and standard would be
  4. statistics

    So if a depression scale has 30 items in it, and if an individual gets a score of 20 what does this mean?
  5. statistics

    So if a scale has 30 items in it, and if an individual gets a score of 20 what does this mean?
  6. Behavioral Statistics

    You have a population that has a mean of 100 and a standard deviation of 15. You randomly draw 100 people out of this population and record the mean score. You repeat the process a large number of times recording the mean score for …
  7. Statistics

    You have a population that has a mean of 100 and a standard deviation of 15. You randomly draw 100 people out of this population and record the mean score. You repeat the process a large number of times recording the mean score for …
  8. statistic

    1. A distribution has a standard deviation of   12. Find the z-score for each of the following locations in the distribution. a. Above the mean by 3 points. b. Above the mean by 12 points. c. Below the mean by 24 points. d. Below …
  9. statistics

    Use the given information to find the minimum sample size required to estimate an unknown population mean u. How many adults must be randomly selected to estimate the mean FICO (credit rating)score of working adults in a country?
  10. Statistics

    In an essay of 250-500 words, thoroughly address the following items and respond to the related questions: 1.Define the term standard deviation. Why is it important to know the standard deviation for a given sample?

More Similar Questions