STAT 503 Final EXAM CORRECT 100%
Is a quantitative variable always measured in numbers? - ANSWERYes
Is any measurement that you record from a sample a variable? - ANSWERFalse
What is a statistic? - ANSWERThe measure that is taken from the whole sample as
a summary of the sample
Sample data skewed to the left, then longer tail is at the... - ANSWERLeft
What is sensitive to outliers? - ANSWERMedian
Formula to calculate standard deviation - ANSWERs = sqrt(sum(x1-xbar)^2 / n-1)
How to calculate degrees of freedom? - ANSWERn-1
What is the first quartile? - ANSWERMedian of lower half
What is the third quartile - ANSWERMedian of upper half
What is included in a box plot summary? - ANSWERQ0 = minimum
Q1 = median of lower half
Q2 = median
Q3 = median of upper half
Q5 = maximum
What is the the interquartile range (IQR)? - ANSWERQ3 - Q1 (shown inside box
plot)
What probability is at the end of the branch on a probability tree? - ANSWERThe
product of the probabilities of the segments of that branch
What are all ultimate outcomes of probability tree? - ANSWERDisjoint outcomes,
non-overlapping
What is an outlier? - ANSWERAny data that is Q3 + 1.5IQR or Q1 - 1.5 IQR
When is a phenomenon random? - ANSWERWhen it has uncertain outcomes in a
short run (sample) but show regular distribution in a long run (population)
What is an outcome? - ANSWERObservation of a variable
What is a probability model? - ANSWERA mathematical description of a random
phenomenon consisting of 2 parts (sample space and way of assigning probability to
event)
Is a quantitative variable always measured in numbers? - ANSWERYes
Is any measurement that you record from a sample a variable? - ANSWERFalse
What is a statistic? - ANSWERThe measure that is taken from the whole sample as
a summary of the sample
Sample data skewed to the left, then longer tail is at the... - ANSWERLeft
What is sensitive to outliers? - ANSWERMedian
Formula to calculate standard deviation - ANSWERs = sqrt(sum(x1-xbar)^2 / n-1)
How to calculate degrees of freedom? - ANSWERn-1
What is the first quartile? - ANSWERMedian of lower half
What is the third quartile - ANSWERMedian of upper half
What is included in a box plot summary? - ANSWERQ0 = minimum
Q1 = median of lower half
Q2 = median
Q3 = median of upper half
Q5 = maximum
What is the the interquartile range (IQR)? - ANSWERQ3 - Q1 (shown inside box
plot)
What probability is at the end of the branch on a probability tree? - ANSWERThe
product of the probabilities of the segments of that branch
What are all ultimate outcomes of probability tree? - ANSWERDisjoint outcomes,
non-overlapping
What is an outlier? - ANSWERAny data that is Q3 + 1.5IQR or Q1 - 1.5 IQR
When is a phenomenon random? - ANSWERWhen it has uncertain outcomes in a
short run (sample) but show regular distribution in a long run (population)
What is an outcome? - ANSWERObservation of a variable
What is a probability model? - ANSWERA mathematical description of a random
phenomenon consisting of 2 parts (sample space and way of assigning probability to
event)
