Is a quantitative variable always measured in numbers? - ANSWER-Yes
Is any measurement that you record from a sample a variable? - ANSWER-False
What is a statistic? - ANSWER-The measure that is taken from the whole sample as a summary of the sample
Sample data skewed to the left, then long...
STAT 503 FINAL EXAM 2023 SOLVED 100% CORRECT
Is a quantitative variable always measured in numbers? - ANSWER-Yes
Is any measurement that you record from a sample a variable? - ANSWER-False
What is a statistic? - ANSWER-The 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... - ANSWER-Left
What is sensitive to outliers? - ANSWER-Median
Formula to calculate standard deviation - ANSWER-s = sqrt(sum(x1-xbar)^2 / n-1)
How to calculate degrees of freedom? - ANSWER-n-1
What is the first quartile? - ANSWER-Median of lower half
What is the third quartile - ANSWER-Median of upper half
What is included in a box plot summary? - ANSWER-Q0 = minimum
Q1 = median of lower half
Q2 = median
Q3 = median of upper half
Q5 = maximum
What is the the interquartile range (IQR)? - ANSWER-Q3 - Q1 (shown inside box plot)
What is an outlier? - ANSWER-Any data that is Q3 + 1.5IQR or Q1 - 1.5 IQR
When is a phenomenon random? - ANSWER-When it has uncertain outcomes in a short run (sample) but show regular distribution in a long run (population)
What is an outcome? - ANSWER-Observation of a variable
What is a probability model? - ANSWER-A mathematical description of a random phenomenon consisting of 2 parts (sample space and way of assigning probability to event)
What is the multiplication rule? (independent) - ANSWER-P(AB) = P(A) P(B|A) = P(B) P(A|B)
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