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Elementary Statistics Assignment PDF

Added on - 16 Nov 2021

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Which of the following is not a measure of variability?
Mode
Standard deviation
All of the answers on this list are measures of
variability!
Range
A scatter plot or scatter chart can be used to identify the association between variables.
According to Dr. Coy in the lecture video, if we can approximate the relationship with a line,
then there is probably a linear relationship between the two variables.
True
False
Unfortunately, if we wish to compute a table of descriptive statistics, we are forced to
calculate all of our statistics using individual Excel formulas. There are no shortcuts!
True
False
The confidencelevelin the descriptive statistics output tells us how much to add and
subtract from the mean to obtain the 95% confidence interval of the mean.
True
False
Match the clues with the answers at right.
A single
value of
each
variable
at a
given
time,
which
often
appears
as one
data row
in your
A
.
Bins
B
.
Normal
C
.
Time series
D
.
Sample
mean
E.Observation
F.Hypothesis
E.
spreadsh
eet.
Grouping
s used to
determin
e the
intervals
in a
frequenc
y
distributi
on.
An
example
is the
record of
closing
stock
prices for
Exxon for
the last
three
years.
A point
estimate
Comparin
g P-value
to the
research
alpha
This
distributi
on has no
skew
Test
Skew has to do with the direction of the longer tail of the distribution. If the skew is positive,
then the longer tail points to the right. For symmetrical distributions like the normal
distribution, the tails are identically sized and have, therefore, no skew.
True
False
It is possible that two variables could have a strong non-linear correlation but have a linear
correlation close to zero.
True
A.
C.
D.
F.
B.
False
if the data exhibits a bell-shaped curve, roughly 68% of the observations will be within
_____________.
3standarddeviationsof the mean.
2standarddeviationsof the mean.
1standarddeviationof the mean.
1.5standarddeviationof the mean.
I know that this question is about the empirical rule, but none of the answers
on this list are correct!
Histogramsare used to learn about the properties of a distribution. These properties can
include shape, skew and multiple modes (e.g., bimodal distribution).
True
False
Variance and standard deviation measure the same attribute of a distribution.
True
False
although correlations close to 1 or -1 are obviously strong, determining whether or not the
correlation between two variables is strong is context specific and somewhat subjectively
determined.
True
False
Which of the following correlation statistics is the strongest?
R
= -
12
%
R
=
41
%
R
= -
91
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