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# Module 2: Descriptive statistics

Learn

Representing dataFrequency tables & dot plotsCreating a histogramInterpreting a histogram

Practice

Creating dot plotsGet 3 of 4 questions to level up!

Reading dot plots & frequency tablesGet 3 of 4 questions to level up!

Create histogramsGet 3 of 4 questions to level up!

Read histogramsGet 3 of 4 questions to level up!

Learn

Worked example: Creating a box plot (odd number of data points)Worked example: Creating a box plot (even number of data points)Constructing a box plotReading box plotsShapes of distributions

Practice

Creating box plotsGet 3 of 4 questions to level up!

Reading box plotsGet 3 of 4 questions to level up!

Shape of distributionsGet 3 of 4 questions to level up!

Learn

Statistics intro: Mean, median, & modeMean, median, & mode exampleCalculating the meanChoosing the "best" measure of centerMean, median, and mode review

Practice

Mean, median, and modeGet 5 of 7 questions to level up!

Calculating the meanGet 3 of 4 questions to level up!

Calculating the medianGet 3 of 4 questions to level up!

Learn

Comparing means of distributionsMeans and medians of different distributionsImpact on median & mean: removing an outlierImpact on median & mean: increasing an outlierMissing value given the meanMean as the balancing point

Practice

Calculating the mean: data displaysGet 3 of 4 questions to level up!

Calculating the median: data displaysGet 3 of 4 questions to level up!

Effects of shifting, adding, & removing a data pointGet 3 of 4 questions to level up!

Missing value given the meanGet 3 of 4 questions to level up!

Learn

Example: Comparing distributionsMean absolute deviation example

Practice

Comparing data distributionsGet 3 of 4 questions to level up!

Comparing center and spreadGet 5 of 7 questions to level up!

Mean absolute deviation (MAD)Get 3 of 4 questions to level up!

Learn

Population standard deviationSample standard deviation and biasThe idea of spread and standard deviationPopulation and sample standard deviation review

Practice

Sample and population standard deviationGet 3 of 4 questions to level up!

Learn

Interquartile range (IQR)Interpreting box plotsJudging outliers in a dataset

Practice

Interquartile range (IQR)Get 3 of 4 questions to level up!

Interpreting quartilesGet 3 of 4 questions to level up!

Identifying outliersGet 3 of 4 questions to level up!

Learn

Comparing distributions with dot plots (example problem)Comparing dot plots, histograms, and box plots

Practice

Comparing distributionsGet 3 of 4 questions to level up!

Comparing data displaysGet 3 of 4 questions to level up!

Learn

Two-way frequency tables and Venn diagramsTwo-way frequency tablesTwo-way relative frequency tables

Practice

Create two-way frequency tablesGet 3 of 4 questions to level up!

Read two-way frequency tablesGet 3 of 4 questions to level up!

Create two-way relative frequency tablesGet 3 of 4 questions to level up!

Read two-way relative frequency tablesGet 3 of 4 questions to level up!

Learn

Interpreting two-way tablesCategorical data exampleAnalyzing trends in categorical dataTwo-way relative frequency tables and associations

Practice

Interpret two-way tablesGet 3 of 4 questions to level up!

Trends in categorical dataGet 3 of 4 questions to level up!

Learn

Constructing a scatter plotExample of direction in scatterplots

Practice

Constructing scatter plotsGet 3 of 4 questions to level up!

Positive and negative linear associations from scatter plotsGet 3 of 4 questions to level up!

Learn

Fitting a line to dataEstimating the line of best fit exerciseEstimating with linear regression (linear models)Interpreting slope of regression lineInterpreting y-intercept in regression model

Practice

Eyeballing the line of best fitGet 3 of 4 questions to level up!

Describing trends in scatter plotsGet 3 of 4 questions to level up!

Estimating equations of lines of best fit, and using them to make predictionsGet 3 of 4 questions to level up!

Interpreting slope and y-intercept for linear modelsGet 3 of 4 questions to level up!

Learn

Introduction to residuals and least squares regressionCalculating residual exampleIntroduction to residualsResidual plots

Practice

Calculating and interpreting residualsGet 3 of 4 questions to level up!

Residual plotsGet 3 of 4 questions to level up!

Learn

Bivariate relationship linearity, strength and directionPositive and negative associations in scatterplotsExample: Correlation coefficient intuitionCorrelation and causalityCalculating correlation coefficient rCorrelation coefficient review

Practice

Correlation coefficient intuitionGet 3 of 4 questions to level up!