Exam 2 vocab terms

Exam 2 vocab terms - VOCABULARY TERMS CHAPTER 4 unit the...

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VOCABULARY TERMS: CHAPTER 4 unit - the item or object we observe subject - unit is a person observation - information or characteristics recorded for each unit variable - characteristic that can vary from unit to unit data set - collection of observations on one or more variables qualitative variables - (aka categorical variables) classify units into categories. Categories may or may not have a natural ordering. quantitative variables - have numerical values that are measurements (length, weight, etc) or counts (of how many). discrete variable - able to count number of possible values continuous variable - able to take on any value within a given integral distribution (of a variable) - provides possible values that a variable can take on and how often these possible values occur. Shows the pattern of variation of the variable Graphical ways to display distribution: quantitative- frequency plots, stem-and-leaf plots, histograms, time plots, scatterplot pie chart - displays the distribution of a qualitative variable by dividing a circle into wedges corresponding to the categories of the variable such that the size of each wedge is proportional to the percentage of items in that category bar graph - displays the distribution of a qualitative variable by listing the categories of the variable along one axis and drawing a bar over each category with a height (or length) equal to the percentage of items in that category. Bars should be of equal width. frequency table - way to present data on two qualitative variables marginal distribution of the row variable - found by computing the percentage of each row total based on the grand total (the entire sample size) marginal distribution of the column variable - found by computing the percentage of each column total based on the grand total

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conditional distribution of the row variable - given the column variable, found by
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Exam 2 vocab terms - VOCABULARY TERMS CHAPTER 4 unit the...

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