I have a difficult question !
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- This topic has 4 replies, 4 voices, and was last updated 14 years, 5 months ago by
Mikel.
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January 12, 2008 at 9:38 pm #49091
black beltParticipant@black-beltInclude @black-belt in your post and this person will
be notified via email.I have two groups. They are to learning english.
As follows;
First group is a normal group.
Second group learn the english with modern methods (improved).
I have to compare success of groups. But the variation of the person is a big problem. How can i to fix the variation of person ?0January 15, 2008 at 6:25 pm #167241People are an uncontrollable source of variation – common cause.
Have the people in the modern method group been assigned using any special classification methods? If so, these inputs could be used to design factors to partition the SS.
If the people in the two groups have been chosen as random and the desired outcome of the experiment will be to compare the one factor, with two levels e.g. two teaching methods only – with a one variable response e.g. score on a standardized English test, you could use the single factor analysis of variance method to draw your conclusions.
You would have to ensure that the appropriate number of people have been tested to ensure that you have a statistically valid test – e.g. controlled Type II error.
If you have historical testing scores available this can be used as an estimate of the standard deviation for the nominal group. e.g. http://nces.ed.gov/dasol/
With the estimate of standard deviation you can be used to develop the appropriate OC curve for your chosen alpha. Jurans Quality Handbook has some good information on the subject Determining sample sizes for Testing a Hypothesis.
Another approach might be to conduct a before and after treatment analysis e.g. administer the standardized test to each group before and after testing in essence blocking the people out of the analysis. This provides an estimate of each teams ability before and after. Then you can test the hypothesis that difference in the over all groups average increase is significant.
0January 15, 2008 at 7:01 pm #167243I find cattle prods and 2×4’s useful.
0January 16, 2008 at 12:07 am #167254
everyman_against stanParticipant@everyman_against-stanInclude @everyman_against-stan in your post and this person will
be notified via email.2 years I check out of this forum, i stop in today on a lark….damn, stand hasn’t gone away…see you in 2010
0January 16, 2008 at 3:12 am #167257See you in 2010
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