Doctors at a technology research facility randomly assigned equal numbers of people to use computer keyboards in two rooms. In one room a group of people typed a manuscript using standard keyboards, while in the other room people typed the same manuscript using ergonomic keyboards to see if those people could type more words per minute. After collecting data for several days the researchers tested the hypothesis H₀: µ₁ - µ₂ = 0 against the one-tail alternative and found a P-value of 0.22. Which is true?
A) None of these.
B) The people using ergonomic keyboards type 22% more words per minute.
C) There's a 22% chance another experiment will give these same results.
D) There's a 22% chance that people using ergonomic keyboards type more words per minute.
E) There's a 22% chance that there's really no difference in typing speed.

Question

Quizplus · Accepted Answer

The P-value of 0.22 indicates the probability of observing the data (or something more extreme) assuming the null hypothesis is true. It does not indicate the percentage more words typed, the chance of replicating the results, the chance that ergonomic keyboards are more effective, or the chance that there's no difference in typing speed.

Doctors at a Technology Research Facility Randomly Assigned Equal Numbers