Posted by trg on Monday, September 27, 2010 at 3:29pm.
1. For the following exercise, complete the following:
a. Find the mean, median, and range for each of the two data sets.
b. Find the standard deviation using the rule of thumb for each of the data sets.
c. Compare the two sets and describe what you discover.
The following data sets shows the ages of the first seven presidents (President Washington through President Jackson) and the seven most recent presidents including President Obama. Age is given at time of inauguration.
First 7: 57 61 57 57 58 57 61
Second 7: 61 52 69 64 46 54 47

statistics  PsyDAG, Wednesday, September 29, 2010 at 12:39pm
We do not do your work for you. Once you have answered your questions, we will be happy to give you feedback on your work. Although it might require more time and effort, you will learn more if you do your own work. Isn't that why you go to school?
Range = highest score  lowest
Median = 50th percentile. Arrange scores in order of value. Middlemost value = median. If two middlemost values, find mean of the two middlemost values.
Don't know what rule of thumb you mean.
For standard deviation, 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.