Model 2 Foot Width in a High School Classroom Female foot width (cm) sum of all data values Mean = number of data values Median = Middle value of an ordered set of data. Mode = Most frequently occurring value in a set of data. 11. Refer to the data in Model 2. a. What value for foot width is most frequent in males? 6, What is this value called? 12. Determine the median value for foot width for males and for females. Describe in complete sen- tences the method you used to determine the median values. 13. Determine the mean for each data group, and describe in a complete sentence how you calculated them. Read This! Within a data set there may be individual values that seem uncharacteristic or do not fit the general trend. These data points may be referred to as outliers or anomalous data. In most samples, a small number of outliers is to be expected, due to the variation inherent in any naturally-occurring population. Outliers can also result from errors in measurement or in the recording of data. Normal variation can often be dis- tinguished from error by repeating the measurements to see if the same range is obtained. Scientists also use statistical calculations to determine the expected range of data, so that judgments can be made about the authenticity of individual data points. Outliers should not be ignored, however, as many interesting scientific discoveries have resulted from the study of such unexpected findings. Analyzing and Interpreting Scientific Data ESS