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  3. HarvardX Data Science Module 4 - Inference and Modeling

Exercise

Exercise 13 - Compute the Estimates

The answer to the previous question depends on \(\sigma_1\) and \(\sigma_2\), which we don't know. We learned that we can estimate these values using the sample standard deviation.

Compute the estimates of \(\sigma_1\) and \(\sigma_2\).

Instructions

100 XP
  • Group the data by pollster.
  • Summarize the standard deviation of the spreads for each of the two pollsters. Name the standard deviation s.
  • Store the pollster names and standard deviations of the spreads (\(\sigma\)) in an object called sigma.