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Math Review of Scatterplots, Trend Lines, and Median-Fit Lines
Math Review of Scatterplots, Trend Lines, and Median-Fit Lines 150 150 Deborah

Overview Data in real-world situations doesn’t always fall into neat linear relationships. The actual values may be plotted in a scatterplot. Trend lines approximate the direction and size of the…

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Math Review of Descriptive Statistics
Math Review of Descriptive Statistics 150 150 Deborah

Overview Descriptive statistics are measurements of a data set that summarize information about the raw scores. Some types include distributions of scores, measures of central tendency, and measures of variability.…

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Math Review of Relative Frequency
Math Review of Relative Frequency 150 150 Deborah

Overview: Relative frequencies refer to estimates of probabilities taken from actual data.  Suppose that a survey of 1000 voters is taken and 213 of them state that they are going…

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Math Review of Fitting a Line to Data
Math Review of Fitting a Line to Data 150 150 Deborah

Overview: When data points are plotted onto a standard graph, that is only the first step in determining the nature of the relationship.  The next step is to determine if…

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Representing Data: Ranges, Quartiles, and Box-and-Whisker Plots
Representing Data: Ranges, Quartiles, and Box-and-Whisker Plots 150 150 Deborah

Overview: Raw data from any series of measurements, such as test scores, heights, or sales figures, usually needs to be organized in some way before it can be used.  One…

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Representing Data: Frequency Distributions and Stem and Leaf Plots
Representing Data: Frequency Distributions and Stem and Leaf Plots 150 150 Deborah
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A Statistics Review of Confidence Intervals
A Statistics Review of Confidence Intervals 150 150 Deborah

Overview:  What Is a Confidence Interval? Unless the population is small enough to determine each member, researchers cannot know the exact value of the population mean.  However, using statistical techniques,…

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Who’s Afraid of the Normal Curve?
Who’s Afraid of the Normal Curve? 150 150 Deborah

Overview:  What Is the Normal Curve? The normal curve is a frequency distribution with special statistical properties.  The best-known application of the normal curve is the distribution of intelligence as…

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Statistics: How to Use Frequency Distributions
Statistics: How to Use Frequency Distributions 150 150 Deborah

Overview:  What Is A Frequency Distribution? A frequency distribution can yield a lot of information about the results of an experiment or survey, even before any more complex statistical analysis…

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Keeping Statistics Honest: How Not to Lie with Statistics
Keeping Statistics Honest: How Not to Lie with Statistics 150 150 Deborah

Overview:  Statistics Are Not Lies The use of statistics has really gotten a bad name.  No less a personage than Mark Twain once said something about lies and statistics, and…

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