EXST 2201 PRACTICE EXAM
QUESTIONS WITH CORRECT
ANSWERS (VERIFIED ANSWERS)
CONTINUOUS data can be summarized by (3) - Answer-Grouping Data into CLASSES
1. Frequency Table
2. Histogram
OR
3. Stem-and-leaf Plot
(Continuous data)
Histogram (3) - Answer-1. A graph of a set of data made the same way as a Bar Chart
except:
2. The rectangles DO TOUCH
3. The LOWER LIMIT of each CLASS is marked at the LEFT SIDE of each rectangle
(Continuous data)
Stem-and-Leaf Plot (3) - Answer-1. A graph used to summarize continuous data by
dividing each data point into a stem part and a leaf part and listing these parts
2. Histogram turned sideways
3. Advantage: raw data can be seen to make it easier to find specific data/any
unexpected patterns in data
Distribution Shapes (5) - Answer-1. Symmetric
2. Skewed Left
3. Skewed Right
4. Uniform
5. Bimodal
--maybe look over more?
(Numerical techniques)
Summary Numbers - Answer-A numerical quantity used to describe (or summarize) the
data
Summary Numbers include numbers for (4) - Answer-1. Size
2. Location
3. Spread
4. Association
Numerical Measure of SIZE - Answer-n = number of observations
, Numerical Measure of LOCATION (3) - Answer-1. Mean
2. Median
3. Mode
-each has advantages/disadvantages
-each can be used for a sample or population
Numerical Measure of SPREAD (3) - Answer-1. Range
2. Variance
3. Standard deviation
Numerical Measure of ASSOCIATION (2) - Answer-1. Correlation
2. Least-squares regression
Summary numbers for LOCATION tell where the ____________ of the data is located
on a real number line - Answer-MIDDLE
When talking about summary numbers we need to differentiate between
__________________ and _____________________ - Answer-data from a sample;
data from a population
Parameter (3) - Answer-1. A summary number for a POPULATION
2. Constant because the population does not change
3. Greek letters
Statistic (3) - Answer-1. A summary number for a SAMPLE
2. A variable because the samples vary
3. Roman letters
Resistant Statistic - Answer-A statistic that is NOT SENSITIVE to extreme data values
i.e. the median is a more resistant statistic than the mean (extreme values are
incorporated when calculating mean)
(2.3 Size & Location)
Summary Number for SIZE - Answer-The size of a set of data is the number of
individuals (data points) in the set
Sample = n
Population = N
(Location)
The best measure of location depends on (2) - Answer-1. Type of Data
2. Shape and distribution
Type = Quantitative
Shape = Symmeteric
Best measure of Location = ? - Answer-MEAN
QUESTIONS WITH CORRECT
ANSWERS (VERIFIED ANSWERS)
CONTINUOUS data can be summarized by (3) - Answer-Grouping Data into CLASSES
1. Frequency Table
2. Histogram
OR
3. Stem-and-leaf Plot
(Continuous data)
Histogram (3) - Answer-1. A graph of a set of data made the same way as a Bar Chart
except:
2. The rectangles DO TOUCH
3. The LOWER LIMIT of each CLASS is marked at the LEFT SIDE of each rectangle
(Continuous data)
Stem-and-Leaf Plot (3) - Answer-1. A graph used to summarize continuous data by
dividing each data point into a stem part and a leaf part and listing these parts
2. Histogram turned sideways
3. Advantage: raw data can be seen to make it easier to find specific data/any
unexpected patterns in data
Distribution Shapes (5) - Answer-1. Symmetric
2. Skewed Left
3. Skewed Right
4. Uniform
5. Bimodal
--maybe look over more?
(Numerical techniques)
Summary Numbers - Answer-A numerical quantity used to describe (or summarize) the
data
Summary Numbers include numbers for (4) - Answer-1. Size
2. Location
3. Spread
4. Association
Numerical Measure of SIZE - Answer-n = number of observations
, Numerical Measure of LOCATION (3) - Answer-1. Mean
2. Median
3. Mode
-each has advantages/disadvantages
-each can be used for a sample or population
Numerical Measure of SPREAD (3) - Answer-1. Range
2. Variance
3. Standard deviation
Numerical Measure of ASSOCIATION (2) - Answer-1. Correlation
2. Least-squares regression
Summary numbers for LOCATION tell where the ____________ of the data is located
on a real number line - Answer-MIDDLE
When talking about summary numbers we need to differentiate between
__________________ and _____________________ - Answer-data from a sample;
data from a population
Parameter (3) - Answer-1. A summary number for a POPULATION
2. Constant because the population does not change
3. Greek letters
Statistic (3) - Answer-1. A summary number for a SAMPLE
2. A variable because the samples vary
3. Roman letters
Resistant Statistic - Answer-A statistic that is NOT SENSITIVE to extreme data values
i.e. the median is a more resistant statistic than the mean (extreme values are
incorporated when calculating mean)
(2.3 Size & Location)
Summary Number for SIZE - Answer-The size of a set of data is the number of
individuals (data points) in the set
Sample = n
Population = N
(Location)
The best measure of location depends on (2) - Answer-1. Type of Data
2. Shape and distribution
Type = Quantitative
Shape = Symmeteric
Best measure of Location = ? - Answer-MEAN
