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Sampling
Describing Bivariate
Experiments
Design
Data
Data
Formulas
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The answer is:
A sample of n individuals
selected from a population in a
way that every possible
combination of n individuals is
equally likely is this.
The answer in the form of a question is:
What is a Simple Random Sample
(SRS)?
The answer is:
This is a sample in which simple
random samples are selected
from each of several
homogeneous subgroups of the
population.
The answer in the form of a question is:
What is a stratified random sample?
The answer is:
A sample in which a simple
random sample of heterogeneous
subgroups of the population is
selected is called this.
The answer in the form of a question is:
What is a cluster sample?
The answer is:
A sample where every kth
individual is selected from a list
or queue is this.
The answer in the form of a question is:
What is a systematic random
sample?
The answer is:
This is a sample composed of
individuals who are easily
accessed or contacted.
The answer in the form of a question is:
What is a convenience sample?
The answer is:
The principle that potential
sources of variation due to
variables not under consideration
must be reduced is known as this.
The answer in the form of a question is:
What is control?
The answer is:
A type of experimental design in
which subgroups of the
experimental units are separated
by some characteristic before
treatments are assigned because
they may respond differently to
the treatments is this.
The answer in the form of a question is:
What is blocking?
The answer is:
This is the process by which
treatments are assigned by a
chance mechanism to the
experimental units.
The answer in the form of a question is:
What is randomization?
The answer is:
The practice of reducing chance
variation by assigning each
treatment to many experimental
units is called this.
The answer in the form of a question is:
What is replication?
The answer is:
This is a faux treatment given in
an experiment that resembles the
real treatment under
consideration.
The answer in the form of a question is:
What is a placebo?
The answer is:
This describes the spread of the
middle 50% of a data set.
The answer in the form of a question is:
What is the interquartile range
(IQR)?
The answer is:
This gives benchmarks for
understanding how probability
is distributed under a normal
curve. Also called the 68-9599.7 rule.
The answer in the form of a question is:
What is the empirical rule?
The answer is:
This is the number of standard
deviations an observation lies
from the mean.
The answer in the form of a question is:
What is a z-score or standardized
score?
The answer is:
These divide the data set into 100
equal parts. An observation at the
pth this is higher than p percent
of all observations.
The answer in the form of a question is:
What are percentiles?
The answer is:
This is composed of the
minimum, first quartile, median,
third quartile, and maximum
values in a data set.
The answer in the form of a question is:
What is the Five-number summary?
The answer is:
A type of graphical display used to
visualize bivariate data is this. The
explanatory variable is shown on
the horizontal axis and the response
variable is shown on the vertical
axis.
The answer in the form of a question is:
What is a scatterplot?
The answer is:
This is a measure of the strength of a
linear relationship between two
variables.
The answer in the form of a question is:
What is the correlation coefficient or
r?
The answer is:
This is the percent of variation in
the response variable explained
by its linear relationship with the
explanatory variable.
The answer in the form of a question is:
What is the coefficient of
determination or r2?
The answer is:
The difference between the
observed value of the response
variable and the predicted value
is called this.
The answer in the form of a question is:
What is a residual?
The answer is:
This is the line of “best fit” that is
calculated by minimizing the sum of
the squares of the differences
between the observed and predicted
values of the line.
The answer in the form of a question is:
What is the Least Squares
Regression Line or LSRL?
The answer is:
p z
*
 
p 1 p
n
The answer in the form of a question is:
What is the confidence interval for a
proportion?
The answer is:
X t
*
s
n
The answer in the form of a question is:
What is the confidence interval
for means?
The answer is:
z 
p  p0
p0 (1  p0 )
n
The answer in the form of a question is:
What is the test statistic for a
hypothesis test about a
proportion?
The answer is:
z 
x  0

n
The answer in the form of a question is:
What is the test statistic for a
hypothesis test about a mean
when the population standard
deviation is known?
The answer is:
x  0
t 
s
n
The answer in the form of a question is:
What is the test statistic for a
hypothesis test about a mean
when the population standard
deviation is unknown?