# Statistics Exam 1

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statistic
A __________ is a numerical summary of a sample.
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parameter
A __________ is a numerical summary of a population.
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matched
A matched-pairs design is an experimental design in which the experimental units are ___________.
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lurking variable
A _____________ is an explanatory variable that was not considered in a study, but that affects the value of the response variable in the study.
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Simple random sampling
__________ is the process of using chance to select individuals from a population to be included in the sample.
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1
In a relative frequency distribution, the sum of relative frequencies should be ______.
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residual
A ______ is the difference between the corresponding observed and predicted values.
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2
The first quartile of the data 2, 4, 6, 6, 8, 9, 9, 10 is _________.
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68%
For a bell-shaped data distribution, __________ of data are within one standard deviation of the mean.
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2
The mean and standard deviation of a sample are 12 and 3, respectively. The z-score of the data 18 is _________.
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True
Inferences based on voluntary response samples are generally not reliable.
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True
If the results of the sample are not representative of the population, then the sample has bias.
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True
Generally, the goal of an experiment is to determine the effect that treatments will have on the response variable.
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False
A data set will always have exactly one mode.
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True