z2ctx-whlevine-00078quiz action-takeQuiz&quiz;_probGuid-QNAPCOA801010000003dd58b

Question

z2ctx-whlevine-00078quiz action-takeQuiz&quiz;_probGuid-QNAPCOA801010000003dd58bb01b00008ck m. in a study examining the effect of humor on interpersonal attractions, McGee and Shevlin (20c9) sense of humor had a significant effect on how he was perceived by women. In the study, female college students were given brief descriptions of a potential romantic partner and then rated the attractiveness of the male on a scale from 1 (low) to 7 (high). The fidtitious male was desanbed positively as being single, ambitious, and having good job prospects. In one condition, the description also said that he had a great sense of humor. The results showed that the description was rated signifcantly higher when'a sense of humor was induded. To examine this effect researcher selected a sample of n- 16 college males and asked them to read a brief descaription of a female and then rate the attractiveness of the woman in the description. The description had modified by adding a statement describing a good sense of humor. Based on the previous research, the rating scores for the original description were known to form a normal distribution with -4.0 with a standard deviation of o 0.60. The sample of humor to the description significantly increases the rating scores? been used in previous research but was mean for the modified description was M- 4.42. Do the sample data indicate that adding a sense Standard Normal Distribution Mean-0.0 Standard Deviation 1.0 500050 3.0 2.0 10 2.0 3.0 Using the standard 4-step procedure, conduct a one-tailed hypothesis test with a -05. Step 1, Ho: - Step 2. The critical region consists of Step 3. For these data the standard error is Step 4. : Hi: and Z which in the critical region the null hypothesis, and conclude that adding a sense. of humor to the descriptiodn the rating scores

Explanation / Answer

Step 1 :

H0 : = 4

Ha : > 4

Step 2 :

Here the test is one- tailed so Here critical test statistic for alpha = 0.05

Zcritical = 1.645

so reject the null hypothesis if test statistic of hypothesiis Z > Zcritical

Step 3 :

stadnard error of sample mean se0= /n = 0.6/16 = 0.6/4 = 0.15

Test statistic

Z= (x - 4)/se0 = (4.42 - 4.0)/0.15 = 2.8

which is outside the critical region.

Step 4 : Reject the null hypothesis , and conclude that adding a sense of humour to description increases the ration scores.

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