THE ULTIMATE STATS STUDY GUIDE

Jun 17th, 2015
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When we conduct a study that looks at only one variable, we say that we are working with univariate data. Suppose, for example, that we conducted a survey to estimate the average weight of high school students.

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THE ULTIMATE STATS STUDY GUIDEAP Statistics Tutorial: Variables. Univariate vs. Bivariate DataStatistical data is often classified according to the number of variables being studied.Univariate data. When we conduct a study that looks at only one variable, we say that we are working with univariate data. Suppose, for example, that we conducted a survey to estimate the average weight of high school students. Since we are only working with one variable (weight), we would be working with univariate data.Bivariate data. When we conduct a study that examines the relationship between two variables, we are working with bivariate data. Suppose we conducted a study to see if there were a relationship between the height and weight of high school students. Since we are working with two variables (height and weight), we would be working with bivariate data AP Statistics: Measures of Central TendencyStatisticians use summary measures to describe patterns of data. Measures of central tendency refer to the summary measures used to describe the most "typical" value in a set of values. The Mean and the MedianThe two most common measures of central tendency are the median and the mean, which can be illustrated with an example. Suppose we draw a sample of five women and measure their weights. They weigh 100 pounds, 100 pounds, 130 pounds, 140 pounds, and 150 pounds.To find the median, we arrange the observations in order from smallest to largest value. If there is an odd number of obs

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