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WGU C955 OBJECTIVE ASSESSMENT APPLIED PROBABILITY AND STATISTICS
OA EXAM LATEST 2025 ACTUAL EXAM WITH COMPLETE EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR VERIFIED||
Members of the sample may choose not to respond. Similar to
Non Response. - ANSWER-Voluntary sample
Participants are easy for researcher to access. Tends to increase
bias. - ANSWER-Convenience sample
Sample frame is divided into groups, we select a few groups, then
selecting ALL of the members of those groups. - ANSWER-
Cluster sample
Sample frame is divided into groups. Then we choose a random
sample (usually the same size) from within EVERY group. -
ANSWER-Stratified sample
Multiple rounds of randomness and grouping. For example:
randomly selecting a few groups, then choosing a small random
sample just those selected groups. Often a combination of Cluster
and Stratified Sampling. - ANSWER-Multi-stage sample
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independent events: P(A and B) = - ANSWER-P(A)*P(B)
P(A and B) ÷ P(B) - ANSWER-P(A|B)
P(A) + P(B) - P(A and B) - ANSWER-P(A or B)
P(A)*P(B|A) - ANSWER-P(A and B)
an image that has 5 number summary:
min, Q1, median, Q3, max, - ANSWER-Box plot
probability combination formula - ANSWER-nCr = n! / r!(n - r)!
an image that has min, Q1, median, Q3, max - ANSWER-Boxplot
A graphical representation -- bars, measuring the frequency within
each interval - ANSWER-Histogram
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Not a symmetric distribution, the tail is on the right, i.e. extra stuff
on the right - ANSWER-Skewed right
Median, the mean (and mode) - ANSWER-Measures of center
Range, IQR & standard deviation - ANSWER-Measures of spread
68% of the data are within 1 standard deviation, 95% are within 2,
99.7 are within 3 standard deviations from the mean. - ANSWER-
Standard Deviation Rule
In this situation, we use median (for center) & IQR (for spread) -
ANSWER-For skewed data, use these for center and spread
In a study, what we think is the "cause" - ANSWER-Explanatory
variable
In a study, what we think is the "effect" - ANSWER-Response
variable
WGU C955 OBJECTIVE ASSESSMENT APPLIED PROBABILITY AND STATISTICS
OA EXAM LATEST 2025 ACTUAL EXAM WITH COMPLETE EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (100% VERIFIED ANSWERS) |ALREADY
GRADED A+| ||PROFESSOR VERIFIED||
Members of the sample may choose not to respond. Similar to
Non Response. - ANSWER-Voluntary sample
Participants are easy for researcher to access. Tends to increase
bias. - ANSWER-Convenience sample
Sample frame is divided into groups, we select a few groups, then
selecting ALL of the members of those groups. - ANSWER-
Cluster sample
Sample frame is divided into groups. Then we choose a random
sample (usually the same size) from within EVERY group. -
ANSWER-Stratified sample
Multiple rounds of randomness and grouping. For example:
randomly selecting a few groups, then choosing a small random
sample just those selected groups. Often a combination of Cluster
and Stratified Sampling. - ANSWER-Multi-stage sample
,2|Page
independent events: P(A and B) = - ANSWER-P(A)*P(B)
P(A and B) ÷ P(B) - ANSWER-P(A|B)
P(A) + P(B) - P(A and B) - ANSWER-P(A or B)
P(A)*P(B|A) - ANSWER-P(A and B)
an image that has 5 number summary:
min, Q1, median, Q3, max, - ANSWER-Box plot
probability combination formula - ANSWER-nCr = n! / r!(n - r)!
an image that has min, Q1, median, Q3, max - ANSWER-Boxplot
A graphical representation -- bars, measuring the frequency within
each interval - ANSWER-Histogram
, 3|Page
Not a symmetric distribution, the tail is on the right, i.e. extra stuff
on the right - ANSWER-Skewed right
Median, the mean (and mode) - ANSWER-Measures of center
Range, IQR & standard deviation - ANSWER-Measures of spread
68% of the data are within 1 standard deviation, 95% are within 2,
99.7 are within 3 standard deviations from the mean. - ANSWER-
Standard Deviation Rule
In this situation, we use median (for center) & IQR (for spread) -
ANSWER-For skewed data, use these for center and spread
In a study, what we think is the "cause" - ANSWER-Explanatory
variable
In a study, what we think is the "effect" - ANSWER-Response
variable
