Statistics

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?

  1. 👍 1
  2. 👎 0
  3. 👁 2,165
  1. a. mean = 35; standard deviation of 5 stays the same.

    b. mean = 90; standard deviation = 15

    1. 👍 1
    2. 👎 1
  2. 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 z��1.00 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.

    1. 👍 0
    2. 👎 0
  3. bb

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Statistics

    A college statistics class conducted a survey of how students spend their money. They asked 25 students to estimate how much money they typically spend each week on fast food. They determined that the mean amount spent on fast

  2. Statistics

    1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they

  3. Statistics

    The t distribution should be used when ___. the sampling population is not normal the sampling population is unimodal The sampling distribution is normal and the population standard deviation is unknown the population standard

  4. Statistics

    1) Let z be a normal random variable with mean 0 and standard deviation 1. The 4th decile of z is ___. a) 0.67 b) –1.25 c) -0.25 d) 1.28 e) 0.50 2) According to the central limit theorem, if a sample of size 50 is drawn from a

  1. Math

    Roughly speaking, the standard deviation indicates how far, on average, the observations are from the mean. Do you think that for the data set below the standard deviation will give a good indication of the typical deviation from

  2. statistics

    A statistics practitioner would like to estimate a population mean to within 50 units with 99% confidence given that the population standard deviation is 250. a) What sample size should be used. b) Repeat part (a) with a standard

  3. statistics

    what are the mean and standard deviation of a sampling distribution consisting of samples of size 16? these sameples were drawn from a population whose mean is 25 and who standard deviation is 5. a. 25 and 1.25 b. 5 and 5 c. 25

  4. 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

  1. business statistics

    A sample of 40 investment customers serviced by an account manager are found to have had an average of $23,000 in transactions during the past year, with a standard deviation of $8500. A sample of 30 customers serviced by another

  2. statistics

    What is the formula to do this exercise, Please. A sample of 40 investment customers serviced by an account manager are found to have had an average of $23,000 in transactions during the past year, with a standard deviation of

  3. statistics

    A researcher administered a treatment to a sample of participants selected from a population of 80. If the researcher obtains a sample mean of M=88. Which combination of factors is most likely to result in rejecting the null

  4. statistics

    A population has a mean =80 and a standard deviation =8. find the mean and standard deviation of a sampling distribution of sample means with sample size=64

You can view more similar questions or ask a new question.