30 secretaries are selected to test a one-hour training course on speed typing. They are divided into two groups by random, one group has 14 secretaries and received the training and the other group has 16 secretaries and did not receive the training. Then all secretaries were asked to type a text for 5 minutes.

The tables below record the number of words that each secretary typed in 5 minutes by the status of rain.

The tables below record the number of words that each secretary typed in 5 minutes by status of raining. Table 1: Number of words typed, 16 secretaries not received the training