Business Statistics Final Ch 4
TRUE or FALSE: standard deviation is not a measure of position
TRUE
What would be an example of good variables to use for a contingency table?
favorite color and gender
If a set of data exhibits positive skewness, then what coefficient would be expected of Pearson's coefficient of skewness?
it should be close to 3; must be between -3 and 3
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contingency tables are used for summarizing data of ___ and ___ data
nominal; ordinal
formula for an outlier that <Q3
outlier<Q1 - 1.5 (Q3-Q1)
formula for an outlier that >Q3
outlier>Q3 + 1.5 (Q3-Q1)
when you create a dot plot, you:
pile up dots that are too close to show separately and place a dot along a horizontal scale for each observation
a distribution is negatively skewed if it is___
skewed to the left
a distribution is positively skewed if it is ___
skewed to the right
four commonly-observed shapes of a distribution
symmetric, positively skewed, negatively skewed, and bimodal
symmetric distribution
the mean and median are equal and the data values are evenly spread among these values
in a negatively skewed distribution:
the mean is smaller than the median
to construct a box plot, you need___(5 things)
the minimum value, the first quartile, the median, the second quartile and the maximum value
when a distribution is positively skewed:
the values extend much farther to the right than to the left, the mean is larger than the median
What is the measure of position in which 75% of observation occur?
third quartile
