INTRODUCTION TO STATISTICAL INVESTIGATIONS UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS COMPLETE STUDY GUIDE FULL SOLUTION

INTRODUCTION TO STATISTICAL
INVESTIGATIONS UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE FULL SOLUTION

●● Six steps of a statistical investigation
Answer: A framework for learning from data.


●● Data
Answer: The values measured or categories recorded on individual
objects of interest.


●● Observational unit
Answer: The individual object on which data are recorded.


●● Variable
Answer: A characteristic being recorded about the observational units.


●● Quantitative variable
Answer: A variable that has numeric values for which ordinary
arithmetic makes sense.

, ●● Categorical variable
Answer: A variable that places observational units into categories.


●● Distribution
Answer: The pattern of outcomes of a variable.


●● Dotplot
Answer: A graph with one dot representing the variable outcome for
each observational unit.


●● Histogram
Answer: A graph that separates the quantitative variable into bins and
displays the number of observations in each bin.


●● Shape of a distribution
Answer: Described by the number of peaks and whether one side of the
distribution tends to stretch out longer than the other.


●● Center of a distribution
Answer: The middle or typical value.


●● Variability of a distribution
Answer: The spread in the observations.