EXST 2201 EXAM QUESTIONS WITH
ALL CORRECT ANSWERS
Cumulative Relative Frequency - Answer-The sum of relative frequency up through, and
including, the category of interest
Bar Chart - Answer-A graph of a set of data made with:
1. Categories on X axis
2. Frequencies on Y axis
-rectangles do NOT touch
-value of each is marked in the middle
Pareto Chart - Answer-A bar chart whose bars are drawn in order of decreasing height
Pie Chart - Answer-A circle divided into wedges, where each wedge represents a
category and the size of the wedge represents the relative frequency of a category (not
useful)
Distribution: - Answer-SHAPE, LOCATION, SPREAD
Histogram (discrete data) - Answer-A graph of a set of data made the same way as a
bar chart except:
1. rectangles DO touch
2. value of each class is marked at the middle of the rectangle
5-20 bars <
Histogram (continuous data) - Answer-A graph of a set of data made the same way as a
bar chart except:
1. rectangles DO touch
2. lower limit of each class is marked at the left side of rectangle
5-20 bars >
Stem-and-Leaf Plot - Answer-A graph to summarize continuous data by dividing each
data point into a stem part and a leaf part (histogram turned sideways)
Skewed Right - Answer-Peak left
Skewed Left - Answer-Peak right
Summary Numbers - Answer-A numerical quantity used to describe (or summarize)
data
, Size - Answer-Number of observations
Location - Answer-Mean, median, mode
Spread - Answer-Range, variance, standard deviation
Parameter - Answer-A summary number for a population (mu, sigma, rho)
Statistic - Answer-A summary number for a sample (x bar, s, r)
Resistant Statistic - Answer-A statistic that is not sensitive to extreme data values
(median is more resistant than the mean)
Size - Answer-The size of a set of data is the number of individuals (data points) in the
set
-sample: n
-population: N
Mean - Answer-The arithmetic average of all the data points
-sample: x bar
-population: mu
Weighted Average - Answer-The average when the numbers have different weights
Median - Answer-The numerical value that lies in the middle of a ranked set of data
-sample: M
-population: M
Mode - Answer-The value that occurs most frequently in a set of data
Range - Answer-The difference between the largest and the smallest data value
Interquartile Range - Answer-The difference between the 75th percentile and the 25th
percentile (IQR=Q3-Q1)
Variance - Answer-The 'average' of the squared deviations of the data points from their
mean
-sample: s^2
-population: (sigma)^2
Standard Deviation - Answer-The square root of the variance
-sample: s
-population: sigma
kth Percentile - Answer-The number that divides a set of ranked data points into two
sets; the lower kth% and the upper (100-k)% of the data points
ALL CORRECT ANSWERS
Cumulative Relative Frequency - Answer-The sum of relative frequency up through, and
including, the category of interest
Bar Chart - Answer-A graph of a set of data made with:
1. Categories on X axis
2. Frequencies on Y axis
-rectangles do NOT touch
-value of each is marked in the middle
Pareto Chart - Answer-A bar chart whose bars are drawn in order of decreasing height
Pie Chart - Answer-A circle divided into wedges, where each wedge represents a
category and the size of the wedge represents the relative frequency of a category (not
useful)
Distribution: - Answer-SHAPE, LOCATION, SPREAD
Histogram (discrete data) - Answer-A graph of a set of data made the same way as a
bar chart except:
1. rectangles DO touch
2. value of each class is marked at the middle of the rectangle
5-20 bars <
Histogram (continuous data) - Answer-A graph of a set of data made the same way as a
bar chart except:
1. rectangles DO touch
2. lower limit of each class is marked at the left side of rectangle
5-20 bars >
Stem-and-Leaf Plot - Answer-A graph to summarize continuous data by dividing each
data point into a stem part and a leaf part (histogram turned sideways)
Skewed Right - Answer-Peak left
Skewed Left - Answer-Peak right
Summary Numbers - Answer-A numerical quantity used to describe (or summarize)
data
, Size - Answer-Number of observations
Location - Answer-Mean, median, mode
Spread - Answer-Range, variance, standard deviation
Parameter - Answer-A summary number for a population (mu, sigma, rho)
Statistic - Answer-A summary number for a sample (x bar, s, r)
Resistant Statistic - Answer-A statistic that is not sensitive to extreme data values
(median is more resistant than the mean)
Size - Answer-The size of a set of data is the number of individuals (data points) in the
set
-sample: n
-population: N
Mean - Answer-The arithmetic average of all the data points
-sample: x bar
-population: mu
Weighted Average - Answer-The average when the numbers have different weights
Median - Answer-The numerical value that lies in the middle of a ranked set of data
-sample: M
-population: M
Mode - Answer-The value that occurs most frequently in a set of data
Range - Answer-The difference between the largest and the smallest data value
Interquartile Range - Answer-The difference between the 75th percentile and the 25th
percentile (IQR=Q3-Q1)
Variance - Answer-The 'average' of the squared deviations of the data points from their
mean
-sample: s^2
-population: (sigma)^2
Standard Deviation - Answer-The square root of the variance
-sample: s
-population: sigma
kth Percentile - Answer-The number that divides a set of ranked data points into two
sets; the lower kth% and the upper (100-k)% of the data points
