Steven Schmidt (1994) conducted a series of experiments examining the effects of humor on memory. In one study, participants were given a mix of humorous and non humorous sentences and significantly more humorous sentences were recalled. However, Schmidt argued that the humorous sentences were not necessarily easier to remember, they were simply preferred when participants had a choice between the two types of sentence. To test this argument, he switched to an independent-measures design in which one group got a set of exclusively humorous sentences and another group got a set of exclusively non humorous sentences. The following data are similar to the results from the independent-measures study.

HumorousSentences	Nonhumorous Sentences
4	5	2	4	6	3	5	3
6	7	6	6	3	4	2	6
2	5	4	3	4	3	4	4
3	3	5	3	5	2	6	4

Use a two-tailed test with = .05.

What is the critical t?

What is the lower bound of the 90% confidence interval?

Althoughdf= 34,df= 30 must be used because of Table B.2.

What is the upper bound of the 90% confidence interval?

What is the lower bound of the 90% confidence interval?