Portage Math 110 Elementary Statistics: Module 2 – Probability, Distributions & Data Analysis – Practice Questions with Correct Answers

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PORTAGE MATH 110 ELEMENTARY
STATISTICS
MODULE 2 PROBABILITY,
DISTRIBUTIONS & DATA ANALYSIS
PRACTICE
QUESTIONS WITH CORRECT ANSWERS


sample variance CORRECT ANSWER✅✅......the difference between

each data point in a data set and the sample mean of the data set n,
which is the number in the sample


deviation about the mean CORRECT ANSWER✅✅......calculated
difference between the data value and the mean



sample standard deviation CORRECT ANSWER✅✅......the positive

square root of the variance



population standard deviation CORRECT ANSWER✅✅......the

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square root of the population variance



coefficient of variation CORRECT ANSWER✅✅......Standard
deviation / mean x 100 (expressed as percentage)
how the size of the standard deviation compares to the mean of the data
set



z-score CORRECT ANSWER✅✅......the number of standard

deviations a particular score is from the mean



empirical rule (bell curve) CORRECT ANSWER✅✅......68.27 -

95.45 - 99.73

The rules gives the approximate % of observations w/in 1 standard
deviation (68%), 2 standard deviations (95%) and 3 standard deviations
(99.7%) of the mean when the histogram is well approx. by a normal
curve

sample covariance CORRECT ANSWER✅✅......Sxy

measures the direction of the linear relationship between two variables


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