EXST 2201 EXAM QUESTIONS
AND ANSWERS RATED 100%
CORRECT
numerical information is usually found through the use of _____ - Answer-summary
numbers
a numerical quantity used to describe (or summarize) data - Answer-summary numbers
characteristic-------------numerical measure (statistic)
1. size
2. location
3. spread
4. association - Answer-1. number of observations
2. mean,median, mode
3. range, variance, standard deviation
4. correlation, least-squares regression
numerical measure (statistic) ------------characteristic
1. number of observations
2. mean,median, mode
3. range, variance, standard deviation
4. correlation, least-squares regression - Answer-1. size
2. location
3. spread
4. association
when we talk about summary numbers we need to differentiate between data from a
____ and data from a _____
the main issues are the symbols and terminology, though some formulas will differ as
well - Answer-sample
population
a summary number for a population
,-) a constant as a population does not change
-) denoted with Greek letters ( mu, sigma, ro) - Answer-parameter
a summary number for a sample
-) a variable as the samples vary
-) denoted with roman letters (x, s, r) - Answer-statistic
a statistic that is not sensitive to extreme data values
-) the median is a more resistant statistic than the mean - Answer-resistant statistic
the _____ of a set of data is the number of individuals (data points) in
-) denoted:
-) sample: n
-) population: N - Answer-size
summary numbers for location tell where the ____ of the data is located on the real
number line - Answer-middle
summary numbers for location tell where the middle of the data is located on the real
number line
to find the middle of the data, imagine a _____ of the data
first we need to determine where the middle of the _____ is, then find where the middle
crosses the real number line
notice that we are condensing a column of data down to one number - Answer-
histogram
three commonly used numerical measures of location - Answer-mean
median
mode
three commonly used numerical measures of location :
1. mean
2. median
, 3. mode
each of these measures of location has different advantages and disadvantages and
can be used for either populations or samples
the best measure of location depends on two factors:
1.____
2.____ - Answer-1. type of data
2. shape of the distribution
data type--distribution shape--best measure of location
1. quantitaive--symetric--______
2. quantitative--highly skewed--_____
3.qualitative--(none)--______ - Answer-1. mean
2. median
3. mode
_____ is a special case of qualitative data - Answer-binomial data
binomial data is a special case of qualitative data
binomial data have only two values:
1.___
2.___ - Answer-1. 0 = failure
2. 1 = success
binomial data is a special case of qualitative data
binomial data have only two values:
1. 0 = failure
2. 1 = success
the best measure of location for binomial data is the ______ (p)
however, the ______ is just the average of the data (x) - Answer-proportion on
successes
the arithmetic average of all the data points
AND ANSWERS RATED 100%
CORRECT
numerical information is usually found through the use of _____ - Answer-summary
numbers
a numerical quantity used to describe (or summarize) data - Answer-summary numbers
characteristic-------------numerical measure (statistic)
1. size
2. location
3. spread
4. association - Answer-1. number of observations
2. mean,median, mode
3. range, variance, standard deviation
4. correlation, least-squares regression
numerical measure (statistic) ------------characteristic
1. number of observations
2. mean,median, mode
3. range, variance, standard deviation
4. correlation, least-squares regression - Answer-1. size
2. location
3. spread
4. association
when we talk about summary numbers we need to differentiate between data from a
____ and data from a _____
the main issues are the symbols and terminology, though some formulas will differ as
well - Answer-sample
population
a summary number for a population
,-) a constant as a population does not change
-) denoted with Greek letters ( mu, sigma, ro) - Answer-parameter
a summary number for a sample
-) a variable as the samples vary
-) denoted with roman letters (x, s, r) - Answer-statistic
a statistic that is not sensitive to extreme data values
-) the median is a more resistant statistic than the mean - Answer-resistant statistic
the _____ of a set of data is the number of individuals (data points) in
-) denoted:
-) sample: n
-) population: N - Answer-size
summary numbers for location tell where the ____ of the data is located on the real
number line - Answer-middle
summary numbers for location tell where the middle of the data is located on the real
number line
to find the middle of the data, imagine a _____ of the data
first we need to determine where the middle of the _____ is, then find where the middle
crosses the real number line
notice that we are condensing a column of data down to one number - Answer-
histogram
three commonly used numerical measures of location - Answer-mean
median
mode
three commonly used numerical measures of location :
1. mean
2. median
, 3. mode
each of these measures of location has different advantages and disadvantages and
can be used for either populations or samples
the best measure of location depends on two factors:
1.____
2.____ - Answer-1. type of data
2. shape of the distribution
data type--distribution shape--best measure of location
1. quantitaive--symetric--______
2. quantitative--highly skewed--_____
3.qualitative--(none)--______ - Answer-1. mean
2. median
3. mode
_____ is a special case of qualitative data - Answer-binomial data
binomial data is a special case of qualitative data
binomial data have only two values:
1.___
2.___ - Answer-1. 0 = failure
2. 1 = success
binomial data is a special case of qualitative data
binomial data have only two values:
1. 0 = failure
2. 1 = success
the best measure of location for binomial data is the ______ (p)
however, the ______ is just the average of the data (x) - Answer-proportion on
successes
the arithmetic average of all the data points
