BCOR 1020 Midterm Fall 2007
True/False:
1.
Inferential statistics
refers to using sample data to estimate unknown population parameters and drawing conclusions
about populations whereas
descriptive statistics
refers to organizing, summarizing, and presenting data.
(a) True
(b) False
2. Categorical data cannot be represented using numbers.
(a) True
(b) False
3. The number of insurance claims processed at in a week is an example of discrete data.
(a) True
(b) False
4. Ordinal data are data that can be ranked.
(a) True
(b) False
5.
Interval and ratio data are quantitative.
(a) True
(b) False
6. A volunteer collecting survey data from shoppers at the Flatirons mall is collecting a random sample of
residents of Boulder County.
7. The Pareto chart is used to display the “significant few” causes of problems.
8. It is appropriate to use the Empirical Rule to describe a population that is leftskewed.
9. Given the sample data set 10, 5, 2, 6, 3, 4, 10, the standard deviation is 3.2.
(a) True
(b) False
10. The sum of all the probabilities of outcomes in a sample space equals one.
1
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11. The general law of multiplication for probabilities says
(
)
(

)
(
)
P A
B
P A B P B
=
�
.
12. Two events are independent if
P(CD) = P(C).
.
13. The compliment of an event
A
, denoted by
'
A
, has probability
)
(
1
)
'
(
A
P
A
P

=
.
(a) True
(b) False
14. A random variable is a function or rule that assigns a numerical value to each outcome in the sample space
of a random experiment.
15. The expected value of a continuous random variable cannot be an integer.
Identifying Distributions:
In each of problems 1619, a random variable or experiment will be described.
Based on the description
identify the appropriate probability model (distribution) from the following list.
You may use one distribution
more than once.
16. Which probability model would best describe the number of accidents at the intersection of two streets over
the course of a month?
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 Spring '08
 TOMNELSON
 Normal Distribution, probability model

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