Math 221  Statistics
Practice Quiz
Week 2
This quiz review covers materials from Weeks 1 and 2. Your quiz will be in Week 3
located in the Quiz Tab. Your quiz will mostly comprise of multiple choice, true/false,
and essay questions. The answers are at the end of the questions.
1.
The measurement that describes the variation of a data set is called the_________.
2.
When a scatter plot's (x,y) points are all pretty close to the "line of best
fit", then how would you describe the relationship between the points?
3.
True or False: Cause and effect relationships cannot be determined using
the coefficient of determination.
4.
True or False: Correlations are used to help identify the relationship
between two variables. For example, the amount of rain in July (x) and the size of
tomatoes in August (y) could be analyzed using correlation and regression
techniques.
5.
The scores of the top ten finishers in a recent LPGA Valley of the Stars
Tournament are listed below. (Source: Los Angeles Times)
73 67 72 67 76 72 73 68 71 73
Find the mode score.
6.
Multiple choice:
The Median is
a. t
he most stable measurement of Central Tendency.
b.
the least stable measurement of Central Tendency.
c. only stable if the standard deviation is small.
d. equal to the InterQuartile Range.
7.
The correlation coefficient (r) can vary between the values of
8.
The ______________________________ measures "how well" the line of
best fit matches the scatter diagram relationship.
9.
The average age of the students in a statistics class is 20 years. Does this
statement describe descriptive statistics, census, simulation, or inferential
statistics?
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10.
Which regression equations show a negative
correlation between x and y.
11.
If we asked each person in the class to count the kinds of email messages
that they received this week (business, personal, advertising) and we recorded the
results, would this data be classified as qualitative or quantitative data?
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 Spring '11
 Dodson
 Regression Analysis, Standard Deviation

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