Spring 2009
STATISTICS 371001
Laughlin
Practice for Midterm Exam #1
You must show all work in order to receive full credit for a problem,
including the formula that is used in solving the problem.
1.
Four scales of measurement were introduced in this class: nominal,
ordinal, interval and ratio.
What additional information is obtained from
measurements on an interval scale compared to measurements on an
ordinal scale?
2.
The following n = 13 scores were obtained on a statistics quiz.
8, 9, 13, 16, 18, 18, 18, 18,
20, 20, 20, 21, 21
(a)
What is the median, Q
1
and Q
2
?
(b)
Graph the data using a stemandleaf plot.
(c)
What type of data are these in terms of question 1 above?
(d)
What is the mode of these scores?
3.
Below is a table of the number of children in families on my street:
Number of
children in
family
Number of
families
0
3
1
5
2
4
3
0
4
1
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Draw a graph of these data using bars.
(b)
What is the mean number of children for families on my street?
4.
Below are 4 samples of n=4 each.
Which sample has the smallest
standard deviation?
Note:
You should
not
need to calculate the
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 Spring '08
 KOSCIK
 Statistics, Normal Distribution, Standard Deviation, west coast, mean number, Laughlin

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