KEY FEATURES: Introduces students to developing research questions and shows their importance in driving research design. Rarely taught topics, such as how to enter and clean data, offer students information missed in both research methods and statistics courses. Shows how to write up survey results for academic, business and nonprofit reports to alleviate the confusion students feel about how to write up findings. Rigorous treatment of sampling focuses on many sampling issues from probability theory to weighting. Offers the process of actually conducting a survey with advice on administering surveys, incentives, and improving response rates.

How Do We Examine Variation in Continuous Variables When Using the Median?

How Do We Examine Variation in Continuous Variables When Using the Median?

Erin Ruel

When the median is the point estimate, then the range and the interquartile range are excellent measures of dispersion. The range is simply the difference between the first and last responses in the distribution. Providing information on the range provides the audience with a feel for the overall size of the distribution. It’s good to use this with the mean also.

The interquartile range provides a measure of dispersion around the median. It is defined as the range of the distribution between the first and third quartiles. It is calculated as the variable’s value at the 75th percentile minus the variable’s value at the 25th percentile. This gives the range of values ...

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