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Module 2: Descriptive statistics
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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!