statistics

posted by .

1) A scale measuring prejudice has been administered to a large sample of respondents. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of sample had scores below 20?

  • statistics -

    normalcdf(-100,20,30,5)

    0.0228

  • statistics -

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Essentials of statistics

    A populations of scores forms a normal distribution with a mean of 40 and a standard deviation of 12 what is the probability of selecting a sample of n=9 scores with a mean less than m=34
  2. Statistics

    For a population with a mean of (mew) = 50 and a standard deviation of 10, how much error, on average, would you expect between the sample mean (M) and the poulation mean for: a) a sample of n=4 scores b) a sample of n=16 scores c) …
  3. statistics

    Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and standard deviation of 4 There are 200 students in a sample. How many of these students will have scores …
  4. Statistics

    Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and standard deviation of 4. There are 200 students in a sample. How many of these students will have scores …
  5. statistics

    A scale measuring prejudice has been administered to a large sample of respondents. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of sample had scores 1) Below 20 …
  6. probability and statistics

    a population forms a normal distribution with a mean of u=80 and a standard deviation of o=15. for each of the following samples, compute the z-score for the sample mean and determine whether the sample mean is a typical, representative …
  7. Math

    I need help with this these two problem PLEASE!!! For a population with a mean of μ  80 and a standard deviation of   12, find the z-score corresponding to each of the following samples. a. M  83 for a sample of n  4 scores …
  8. Statistics

    The distribution of IQ scores is a nonstandard normal distribution with a mean of 100 and a standard deviation of 15. What are the value of the mean and standard deviation after all IQ score have been standardized by converting them …
  9. stats

    (a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed?
  10. stats

    (a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed?

More Similar Questions