PSTAT 5LS Midterm 1 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Data - CORRECT ANSWER - collection of observations
How to chart categorical data - CORRECT ANSWER - bar graphs and pie charts
How to chart quantitative data - CORRECT ANSWER - histograms dotplots, stemplots
Two types of data - CORRECT ANSWER - categorical (qualitative) and quantitative
Statistics - CORRECT ANSWER - the science of data
Population - CORRECT ANSWER - complete collection of all individuals (scores, people,
measurements, etc.) to be studied
Sample - CORRECT ANSWER - group of members selected from a population
Parameter - CORRECT ANSWER - a numerical measurement describing some
characteristic of a population
Population - CORRECT ANSWER - -----> parameter
Statistic - CORRECT ANSWER - a numerical measurement describing some
characteristic of a sample
Sample - CORRECT ANSWER - -----> statistic
, Individuals - CORRECT ANSWER - the objects described by a set of data , may be
people, animals, or things
Variable - CORRECT ANSWER - any characteristic of an individual, can take different
values for different individuals
Outlier - CORRECT ANSWER - observations that lie outside the overall pattern of a
distribution
How to make a stem plot - CORRECT ANSWER - separate each observation into a stem,
consisting of all except the rightmost digit, and a leaf, which is that remaining final digit. Write
stems in a vertical column with the smallest value at the top and draw a vertical line at the right
of this column, then write each leaf in the row to the right of its stem, in increasing order out
from the stem
Dot plot - CORRECT ANSWER - each individual in the data set is shown as some dot on
the horizontal axis representing the variable's scale. Individuals with identical value are
superimposed vertically.
Line graphs - CORRECT ANSWER - time plots: time goes on the x axis and the variable
of interest goes on the y axis
Mean - CORRECT ANSWER - measure of center:
X= (X1+X2+X3+...Xn)/n
Median - CORRECT ANSWER - the midpoint of an observation:
Odd number: (n+1)/2
Even number: (x+x+1)/2
ACTUAL Exam Questions and CORRECT
Answers
Data - CORRECT ANSWER - collection of observations
How to chart categorical data - CORRECT ANSWER - bar graphs and pie charts
How to chart quantitative data - CORRECT ANSWER - histograms dotplots, stemplots
Two types of data - CORRECT ANSWER - categorical (qualitative) and quantitative
Statistics - CORRECT ANSWER - the science of data
Population - CORRECT ANSWER - complete collection of all individuals (scores, people,
measurements, etc.) to be studied
Sample - CORRECT ANSWER - group of members selected from a population
Parameter - CORRECT ANSWER - a numerical measurement describing some
characteristic of a population
Population - CORRECT ANSWER - -----> parameter
Statistic - CORRECT ANSWER - a numerical measurement describing some
characteristic of a sample
Sample - CORRECT ANSWER - -----> statistic
, Individuals - CORRECT ANSWER - the objects described by a set of data , may be
people, animals, or things
Variable - CORRECT ANSWER - any characteristic of an individual, can take different
values for different individuals
Outlier - CORRECT ANSWER - observations that lie outside the overall pattern of a
distribution
How to make a stem plot - CORRECT ANSWER - separate each observation into a stem,
consisting of all except the rightmost digit, and a leaf, which is that remaining final digit. Write
stems in a vertical column with the smallest value at the top and draw a vertical line at the right
of this column, then write each leaf in the row to the right of its stem, in increasing order out
from the stem
Dot plot - CORRECT ANSWER - each individual in the data set is shown as some dot on
the horizontal axis representing the variable's scale. Individuals with identical value are
superimposed vertically.
Line graphs - CORRECT ANSWER - time plots: time goes on the x axis and the variable
of interest goes on the y axis
Mean - CORRECT ANSWER - measure of center:
X= (X1+X2+X3+...Xn)/n
Median - CORRECT ANSWER - the midpoint of an observation:
Odd number: (n+1)/2
Even number: (x+x+1)/2
