WGU STATISTICS EXAM QUESTIONS
WITH 100% CORRECT ANSWERS!!
1 of 86
Term
The Standard deviation rule for "the normal shape" bell curve.
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Apporximatlely 68% of the observations fall within 1 standard deviation, approx.
95% of the observations fall with 2 standard deviations of the mean. Approx.
99.7% (or virtually all) of the observation fall withim three
standard deviations of the mean
, P(A) = 1 - P(not A),
Square each of the deviations: then,Average the square deviations
by adding them up, and dividing by n - 1, (one less than the
sample size):
P(A and B) to P(A) * P(B). If the two are equal, then A and B are
independent, otherwise the two are not independent.
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2 of 86
Term
A scatterplot is a display of
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two quantitative variables single quantitative variable
one categorical variable two qualitative variables
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3 of 86
Definition
,If x and y have a strong negative linear correlation, r
is close to -1. An r value of exactly -1 indicates a
perfect negative fit.
Negative values
indicate a relationship between x and y such that as values
for x increase, values
for y decrease.
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Negative correlation: (r) Positive correlation: (r)
For r, perfect correlation of
No correlation: (r) ± 1 occurs only when
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4 of 86
Term
If A and B Disjoint
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A and B must be independent A and B are always dependent
A and B can be both A and B can not
independent and dependent be indepentdent
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5 of 86
Term
In a probability tree, the second thing to note is that
probabilities of branches that branch out from the same
point always add up to
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two one
three four
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6 of 86
Term
If someone actually has HIV, the probability of testing positive
is .95"
(H) give equasion
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P(A or B) = P(event A
occurs or event B occurs P(T | H) = .95
or both occur)
WITH 100% CORRECT ANSWERS!!
1 of 86
Term
The Standard deviation rule for "the normal shape" bell curve.
Give this one a try later!
Apporximatlely 68% of the observations fall within 1 standard deviation, approx.
95% of the observations fall with 2 standard deviations of the mean. Approx.
99.7% (or virtually all) of the observation fall withim three
standard deviations of the mean
, P(A) = 1 - P(not A),
Square each of the deviations: then,Average the square deviations
by adding them up, and dividing by n - 1, (one less than the
sample size):
P(A and B) to P(A) * P(B). If the two are equal, then A and B are
independent, otherwise the two are not independent.
Don't know?
2 of 86
Term
A scatterplot is a display of
Give this one a try later!
two quantitative variables single quantitative variable
one categorical variable two qualitative variables
Don't know?
3 of 86
Definition
,If x and y have a strong negative linear correlation, r
is close to -1. An r value of exactly -1 indicates a
perfect negative fit.
Negative values
indicate a relationship between x and y such that as values
for x increase, values
for y decrease.
Give this one a try later!
Negative correlation: (r) Positive correlation: (r)
For r, perfect correlation of
No correlation: (r) ± 1 occurs only when
Don't know?
4 of 86
Term
If A and B Disjoint
Give this one a try later!
A and B must be independent A and B are always dependent
A and B can be both A and B can not
independent and dependent be indepentdent
, Don't know?
5 of 86
Term
In a probability tree, the second thing to note is that
probabilities of branches that branch out from the same
point always add up to
Give this one a try later!
two one
three four
Don't know?
6 of 86
Term
If someone actually has HIV, the probability of testing positive
is .95"
(H) give equasion
Give this one a try later!
P(A or B) = P(event A
occurs or event B occurs P(T | H) = .95
or both occur)
