6 As the number of subjects in each sample gets larger,the distribution of means

Question

6 As the number of subjects in each sample gets larger,the distribution of means

begins to look less and less like the normal curve (in terms ofshape).

becomes a better approximation of the normal curve (in terms ofshape).

becomes more positively skewed.

becomes more negatively skewed.

the parameters of the known population distribution.

an estimated distribution calculated by earlier researchfindings.

the distribution of means of all the possible samples in theexperimental condition from the research.

the distribution of means that would arise if the nullhypothesis were true.

For questions 8-11 refer to the followingparagraph:

A psychologist interested in relationships has developed a scalethat measures the degree of affection adult men feel for theirfathers. The data from its development has shown that for thegeneral population the distribution is skewed to the right, themean degree of affection being 60 with a standard deviation of 16.The researcher now is wondering if men who have themselves justbecome new fathers will score higher on the scale than men ingeneral. He samples a group of 100 new fathers and finds that theirmean is 64.5.

8 What is the research hypothesis?

There will be no significant differences between the twopopulations.

The population of new fathers has a higher mean than the mean ofthe population of men in general.

The sample size will significantly affect the level of affectionexperienced.

The two populations (of men in general and of new fathers) havedifferent variances.

9

Based on the information in question 8, what is the mean of thecomparison distribution?

60/100=.60

64.5/100=.645

60

64.5

10 What is the standard deviation of the comparison distributiongiven in question 8?

16 / 100 = .16

162 / 100 = 2.56

begins to look less and less like the normal curve (in terms ofshape).

becomes a better approximation of the normal curve (in terms ofshape).

becomes more positively skewed.

becomes more negatively skewed.

Explanation / Answer

6. becomes a better approximation of the normal curve (interms of shape). 7. the parameters of the known population distribution. 8.The population of new fathers has a higher mean than themean of the population of men in general. 9. mean = 60 10. 16 / 100 = 1.6

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