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Statistics Exam 1
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Statistics Exam 1
Uziah Mitchell
7 September 2022
4.7
(114 reviews)
18 test answers
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(14)
question
statistic
answer
A __________ is a numerical summary of a sample.
question
parameter
answer
A __________ is a numerical summary of a population.
question
matched
answer
A matched-pairs design is an experimental design in which the experimental units are ___________.
question
lurking variable
answer
A _____________ is an explanatory variable that was not considered in a study, but that affects the value of the response variable in the study.
question
Simple random sampling
answer
__________ is the process of using chance to select individuals from a population to be included in the sample.
question
1
answer
In a relative frequency distribution, the sum of relative frequencies should be ______.
question
residual
answer
A ______ is the difference between the corresponding observed and predicted values.
question
2
answer
The first quartile of the data 2, 4, 6, 6, 8, 9, 9, 10 is _________.
question
68%
answer
For a bell-shaped data distribution, __________ of data are within one standard deviation of the mean.
question
2
answer
The mean and standard deviation of a sample are 12 and 3, respectively. The z-score of the data 18 is _________.
question
True
answer
Inferences based on voluntary response samples are generally not reliable.
question
True
answer
If the results of the sample are not representative of the population, then the sample has bias.
question
True
answer
Generally, the goal of an experiment is to determine the effect that treatments will have on the response variable.
question
False
answer
A data set will always have exactly one mode.
question
True
answer
The 75th percentile is the value that separates the lower 75% of data from the upper 25%.
question
False
answer
The correlation coefficient r between two variables x and y can be +2 .
question
True
answer
A designed experiment is a controlled study conducted to determine the e ect that varying one or more explanatory variable has on a response variable.
question
True
answer
If the scatter diagram of the residues has a pattern, then the least-squares regression line is not the appropriate model.
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