INTRODUCTION TO PROBABILITY AND STATISTICS ACTUAL TEST QUESTIONS AND SOLUTIONS COMPREHENSIVE REVIEW PACKAGE

INTRODUCTION TO PROBABILITY AND
STATISTICS ACTUAL TEST QUESTIONS AND
SOLUTIONS COMPREHENSIVE REVIEW
PACKAGE

●● pdf of standard normal
Answer: −∞
e−z2/2dz =√2π


●● Population
Answer: The collection of items under discussion (finite or infinite)


●● Census
Answer: Record observations for entire population


●● Survey
Answer: Observations on a subset of a population


●● Sample
Answer: A subset of a population

,●● Experiment
Answer: Different treatments are applied to different experimental units


●● Observational Study
Answer: Observations on units that are not given treatments


●● Quantitative variable
Answer: Measurements or counts (continuous or discrete)


●● Continuous Variable
Answer: Measurements (interval or ratio scale)


●● Discrete variable
Answer: Counts (usually non-negative integers)


●● Qualitative Variable
Answer: Classifies objects into categories (categorical or ordinal)


●● Categorical variable
Answer: No sense of order in the categories (color of eyes)


●● Ordinal variable

, Answer: Variables have a natural order in the categories (inactive,
slightly active..)


●● Dotplot
Answer: Simplest plot of quantitative data good for showing clusters,
gaps and outliers (up to 25 data)


●● Median
Answer: Middle value of n if odd and average of two middle values if n
is even


●● Range
Answer: Maximum-Minimum (very sensitive to extreme values or
outliers)


●● Minimum
Answer: The smallest value


●● Maximum
Answer: The biggest value


●● Quartiles
Answer: Divide data into four equal parts