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## Quiz 3 : Descriptive Statistics

It is inappropriate to use the mean to analyze data that are not at least interval level in measurement.
Free
True False

True

Average deviation is a common measure of the variability of data containing a set of numbers.
Free
True False

False

The most frequently occurring value in a set of data is called the mode.
Free
True False

True

If the mean of a distribution is greater than the median, then the distribution is positively skewed.
True False
A histogram can be used in business analytics to determine if a variable is approximately normally distributed.
True False
The sum of deviations about the arithmetic mean for a given set of data is always equal to zero.
True False
An appropriate measure of central tendency for ordinal data is the mode.
True False
The average of the squared deviations about the arithmetic mean is called the variance.
True False
Statistical measures used to yield information about the center or the middle parts of a group of numbers are called the measures of central tendency.
True False
A box and whisker plot is determined from the mean, the smallest and the largest values, and the lower and upper quartile.
True False
The coefficient of variation is unitless.
True False
The sample standard deviation is calculated by taking the square root of the population standard deviation.
True False
If the median of a distribution is greater than mean, then the distribution is skewed to the left.
True False
A nonzero value of the skewness indicates asymmetry of the distribution of the data.
True False
The middle value in an ordered array of numbers is called the mode.
True False
An outlier of a data set is determined from the lower and upper quartile
True False