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 1 
BUAD 310 InClass Practice
9/10/09
True/False:
1.
A discrete random variable may assume a countable number of outcome values.
True
False
2.
An example of a quantitative variable is the make of a car.
True
False
3.
A bar chart is a graphic that can be used to depict qualitative data.
True
False
4.
The population mean is the average of the population measurements.
True
False
5.
It is appropriate to use the Empirical Rule to describe a population that is extremely skewed.
True
False
FillintheBlank:
1. The point estimate of the population _______________ is the square root of the sample variance.
2. Another name for the 50th percentile is the _____.
3. The standard deviation of a standard normal distribution is equal to _____.
4. Given that X is a normal random variable, the probability that a given value of X is below its mean is
________________.
5. The variable "employment status" which can take on one of two values: 1 for "employed" and 0 for
"unemployed" is an example of a(n) _____________ random variable.
Multiple Choice:
1.
A recent
Wall Street Journal
poll asked a group of American voters to rate economic conditions
in the United States. 23% of the respondents rated economic conditions as “favorable.” Identify
the population
parameter
of interest in this survey.
A)
Voters selected to participate in the survey
B)
All eligible voters in the U.S.
C)
23%
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D)
The percentage of all voters who would rate economic conditions as favorable
E)
Economic conditions
2.
Which of the following is a categorical variable?
A)
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 Fall '09
 YINGYINGFAN
 Business

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