Homework Help: statistic

Posted by Nickie on Saturday, January 26, 2013 at 6:45pm.

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 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 ?)

statistic - PsyDAG, Sunday, January 27, 2013 at 12:06pm
1. Z = (score-mean)/SD

a. Z = 3/12
You can calculate the rest.

2. a. We cannot sketch a Histogram on a post.

b, c. Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

I'll let you do the calculations.

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