STATISTICS PORTAGE CNSL 503
EXAM 2 QUESTIONS AND CORRECT
ANSWERS
The mean is the preferred measure of central tendency if the distribution is...
ANSW✅✅symmetrical
The mean can be influences by... ANSW✅✅outliers
outliers ANSW✅✅extreme values in a dataset
The mean may not be appropriate when there are... ANSW✅✅outliers
median ANSW✅✅the midpoint of a distribution of scores; may be more appropriate to use when
there are outliers
____% of scores fall above the median and ____% of scores fall below the median.
ANSW✅✅50;50
How to calculate median when there is an odd number of scores? ANSW✅✅arrange scores in
ascending order and identify the middle value
How to calculate median when there is an even number of scores? ANSW✅✅arrange scores in
ascending order and take the average of the 2 middle values
Is the median affected by outliers? ANSW✅✅no
The median is preferred when... ANSW✅✅the distribution contains extreme scores or is skewed
or variables measured on an ordinal scale
mode ANSW✅✅the most common score in a dataset
, The mode is most useful for.... ANSW✅✅variables measured on a nominal scale or to describe the
shape of a distribution (unimodal, bimodal, trimodal)
Use mean for... ANSW✅✅symmetric data
Use median for... ANSW✅✅skewed data
Use mode for... ANSW✅✅describing the peak
variability ANSW✅✅describes the spread of the distribution
measures of variability ANSW✅✅range, interquartile range, sum of squares, variance, standard
deviation
The range and interquartile range are based on... ANSW✅✅only 2 scores
The sum of squares, variance and standard deviation are based on... ANSW✅✅all the scores
related to one another
range ANSW✅✅the difference between the highest value and the lowest value in a dataset
The range is calculated by... ANSW✅✅subtracting the lowest value and the highest value in a
dataset
formula for range ANSW✅✅range= Xmax- Xmin
X=score
Is the range sensitive to outliers? ANSW✅✅yes
interquartile range (IQR) ANSW✅✅calculated by subtracting the lower quartile from the upper
quartile
EXAM 2 QUESTIONS AND CORRECT
ANSWERS
The mean is the preferred measure of central tendency if the distribution is...
ANSW✅✅symmetrical
The mean can be influences by... ANSW✅✅outliers
outliers ANSW✅✅extreme values in a dataset
The mean may not be appropriate when there are... ANSW✅✅outliers
median ANSW✅✅the midpoint of a distribution of scores; may be more appropriate to use when
there are outliers
____% of scores fall above the median and ____% of scores fall below the median.
ANSW✅✅50;50
How to calculate median when there is an odd number of scores? ANSW✅✅arrange scores in
ascending order and identify the middle value
How to calculate median when there is an even number of scores? ANSW✅✅arrange scores in
ascending order and take the average of the 2 middle values
Is the median affected by outliers? ANSW✅✅no
The median is preferred when... ANSW✅✅the distribution contains extreme scores or is skewed
or variables measured on an ordinal scale
mode ANSW✅✅the most common score in a dataset
, The mode is most useful for.... ANSW✅✅variables measured on a nominal scale or to describe the
shape of a distribution (unimodal, bimodal, trimodal)
Use mean for... ANSW✅✅symmetric data
Use median for... ANSW✅✅skewed data
Use mode for... ANSW✅✅describing the peak
variability ANSW✅✅describes the spread of the distribution
measures of variability ANSW✅✅range, interquartile range, sum of squares, variance, standard
deviation
The range and interquartile range are based on... ANSW✅✅only 2 scores
The sum of squares, variance and standard deviation are based on... ANSW✅✅all the scores
related to one another
range ANSW✅✅the difference between the highest value and the lowest value in a dataset
The range is calculated by... ANSW✅✅subtracting the lowest value and the highest value in a
dataset
formula for range ANSW✅✅range= Xmax- Xmin
X=score
Is the range sensitive to outliers? ANSW✅✅yes
interquartile range (IQR) ANSW✅✅calculated by subtracting the lower quartile from the upper
quartile
