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.