Personal Gas Purchases I

The distribution of miles per gallon is slightly left-skewed with no obvious outliers. The center as measured by the mean is 19.35 and the dispersion as measured by the standard deviation is 2.09. I measured center and dispersion with the mean and standard deviation because the distribution was not strongly skewed and no outliers were present.

These results are for a quantitative variable (miles per gallon); thus, you must describe shape, outliers, center, and dispersion of the distribution. In addition, you must explain why you chose to use either the mean and standard deviation or the median and IQR as your measures of center and dispersion (see last sentence).

 

Personal Gas Purchases II

The distribution of price per gallon is approximately symmetric (perhaps slightly right-skewed) with an obvious outlier at $3.609. The center as measured by the median is $2.539 and the dispersion as measured by the IQR is from a Q1 of $2.349 to a Q3 of $2.799. I measured center and dispersion with the median and IQR because an outlier was present.

These results are for a quantitative variable (price per gallon); thus, you must describe shape, outliers, center, and dispersion of the distribution. In addition, you must explain why you chose to use either the mean and standard deviation or the median and IQR as your measures of center and dispersion (see last sentence).

 

Personal Gas Purchases II

It is clear that most (66.9%) gas purchases were made in Ashland. Many other puchases (20.0%) were made in Iron River. Gas purchases were not prevalent in any other town.

These results are for a categorical variable (town where gas was purchased); thus, you do not describe anything specific, rather you generally make a conclusion from the table or bar chart. In this example, there was a category with a clearly higher frequency and a category with a clear second highest frequency, so I made sure to point those two categories out.