Question

(20.37) Researchers claim that women speak significantly more words per day than men. One estimate is that a woman uses about 20,000 words per day while a man uses about 7,000. To investigate such claims, one study used a special device to record the conversations of male and female university students over a four- day period. From these recordings, the daily word count of the 20 men in the study was determined. Here are their daily word counts: 28403 10087 15926 21694 37784 10581 12888 11080 17809 13175 8927 6490 8144 7010 4434 10056 4004 12632 10981 5260 What value we should remove from observation for applying t procedures? A 90% confidence interval (±±10) for the mean number of words per day of men at this university is from  to  words. Is there evidence at the 10% level that the mean number of words per day of men at this university differs from 7000? Yes No

Answer 1

from above:

90% confidence interval for the mean number of words per day of men at this university is from  

to  words =9643.31 ; 16093.19

as confidence interval does not contain 7000;

Therefore No