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:

28418	10083	15938	21696	37779
10567	12876	11074	17805	13176
8913	6501	8149	7008	4420
10060	4000	12638	10983	5263

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 9000?

No

Yes

Answer 1

from abve 90% confidence interval  for the mean number of words per day=9641.47 ;16093.23

2)

as interal contain all values above 9000; therefore here is evidence  at the 10% level that the mean number of words per day of men at this university differs from 9000

Yes