STAT 503 Final EXAM CORRECT 100%

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)