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STAT&ECON 2

# STAT&ECON 2 - M ay 24 2011 Lecture 2 Exam May 31...

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May 24, 2011 Lecture 2 Exam May 31, multiple choices on Chap1, 2, 3 Cross tabulations and scatter diagrams Focused on methods that are used to summarize the data for one variable at time, interested in tabular and graphical methods that will help understand the relationship between two variables Cross tabulation and a scatter diagram are two methods for summarizing the data for two variables simultaneously. A cross tabulation is a tabular summary of data for two variables. -The left and top margin labels define the classes for the two variables. Example Scatter diagram and trend line: A scatter diagram is a graphical presentation of the relationship between two quantitative variables; a trend line provides an approximation of the relationship. X= # of team points 1 14 2 20 3… 22… Slope: Change in Y/ Change in X Data Categorical Data Quantitative Data Tabular Methods: Graphical Methods: Bar/ pie chart Fre distri … Column/row freq dist Crosstabu

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Rel Freq dist Dot plot, histogram, ogive, stem- leaf scatter Percent Freq distri Crosstabu Chap 3 Descriptive statistics: Numerical Measures -Measures of location: Mean, median, mode, percentiles, quartiles If the measures are computed for data from a sample: sample stat (referred to
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STAT&ECON 2 - M ay 24 2011 Lecture 2 Exam May 31...

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