3.2 - Hypothesis Tests with Quantitative data3.2 - Hypothesis Tests with Quantitative data
In this screencast we'll demonstrate testing hypotheses about the mean by calculating a t-statistic - both by hand, and via the built-in function
t-test(). Note that when we use
pt() to calculalte p-values, the wrong tail gives us
1-p rather than
p - the choice of upper or lower tail is important, and easy to get wrong. (Note the use of the tab key for hints on function arguments).