Equip male and female students with a small device that secretly records sound for a random 3030 seconds during each 12.5-minute12.5-minute period over two days. Count the words each subject speaks during each recording period, and from this, estimate how many words per day each subject speaks. The published report includes a table summarizing six such studies. Two of the six aregiven.

	Sample Size	Estimated Average Number (SD) of Words Spoken perDay
Study	Women	Men	Women	Men
11	5656	5656	16,17716,177 (7520)(7520)	16,56916,569 (9108)(9108)
22	2727	2020	16,49616,496 (7914)(7914)	12,86712,867 (8343)(8343)

Readers are supposed to understand that, for example, the 5656 women in the first study had =16,177=16,177 and =7520.=7520. It is commonly thought that women talk more than men. Does either of the two samples support thisidea?

Matthias R. Mehl et al., "Are women really more talkative than men?" Science, 317 (2007), p.82.

Macmillan Learning

Find the twosample statistic for each study. Give your answers to three decimalplaces.