Bootstrap Confidence Interval – Apply It 2

  • Find a bootstrap confidence interval for a population parameter and difference in population parameters
  • Describe what a bootstrap confidence interval means and use it make inference regarding the population

Bootstrap Confidence Interval for Difference in Population Parameters

Step 1: Go to the statistical software: https://istats.shinyapps.io/Boot2samp/
Step 2: For the “Enter Data” option, select “From Textbook.”
Step 3: For “Dataset,” select “Petting vs. Vocal Praise.”
Step 4: For the “Statistic of Interest” option, select “Difference Between Means.”

Now you are ready to create the bootstrap distribution for the difference in sample means.

Step 5: Under the left-hand side of the screen, prompt “Select how many bootstrap samples you want to generate,” click “1,000.”
Step 6: Under “Options,” check the box labeled “Summary Statistics of Bootstrap Distb.”
Step 7: Press the button that says “Draw Bootstrap Sample(s).”

The app will sample the petting data with replacement and separately sample the original vocal praise data with replacement, and then calculate each group’s mean and the difference in the means.