Review for Exam #2
Covers material from Ch 6,7,8,9. Doing the questions at the back of each chapter should help. The odd
numbers have the answers in the back of the book. There will be about 18 questions total, many will be grouped for one set of
analyses.
CH 6
When given proportions or percentages of a sample be able to figure out the alternate proportions, so for instance if
you are told that 20 % of the watch TV 20 hours or less, then you know that 80% watch more than 20 hours a week.
If given a mean and a standard deviation, be able to calculate a z score for a particular score and what that z score
means.
So for instance if you have a mean of 3 and a standard deviation 2 and you are asked what the z score for a
value of 5 is you can plug in the values
Z=(53)/2=1.
So Z=1 and that means 5 is 1 standard deviation above the
mean.
Be able to calculate a raw score (Y) if given
a z score and a mean and a standard deviation.
If for example I ask you to calculate the raw score, or observed value, for a z score of 3 when the standard deviation
is 2 and the mean is 3, you plug the values in Y=3+(3*2)=9. This means that 9 is 3 standard deviations above the
mean.
When given a z score and associated raw score be able to identify the proportion of respondents who:
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 Spring '11
 Heberle

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