In

response to a questionnaire, 57 people answered “yes” to a particular question.

Of these, 8 persons were male. There were 61 people that answered

"no" to the question, and 5 of these were male. If one person is

selected randomly from the group, what is the probability that the person

answered “yes”

Which of the options below is a valid description of a 'construct' in

psychological research?  It is a

A psychologist uses a

psychometric test to study the intelligence of school children. Intelligence is

the - - - - - variable and the psychometric test represents the - - - - - variable

in this study.

Lebo claims that workers in large companies are less work

motivated than workers in small companies. In a previous study involving all

large companies in South Africa, it was found that the average workers’

motivation score on a work motivation questionnaire (where a higher score

indicates a higher level of work motivation) was 50 with a standard deviation

of 15. Lebo plans to present the same questionnaire to a sample of workers from

small companies to determine whether her suspicion is true.

Lebo, a research psychologist, suspects that the addition of

certain food supplements to the diet of elderly people will reduce the decline

in cognitive functioning that comes about because of aging. She decides to test

this using a neuropsychological test that measure perceptual speed (the NPS

test). It is known that the distribution of scores on this test is

approximately normal and that a mean of µ=50 and a standard deviation of σ=15

was found in the population of persons older than 65.

To investigate her hypothesis, Lebo obtains a random sample

of n=100 persons older than 65. Each member of this sample is given a daily

dose of supplements over a period of six months. At the end of this time, each

person is tested on the NPS test and a mean of x¯ = 58.4 and standard deviation

of s = 16.8 is found. She plans to test the hypothesis at α = 0.05.

The

effective difference between the performance of the elderly people tested by

Lebo and elderly people in general is - - - - -.

Lebo claims that workers in large companies are less work

motivated than workers in small companies. In a previous study involving all

large companies in South Africa, it was found that the average workers’

motivation score on a work motivation questionnaire (where a higher score

indicates a higher level of work motivation) was 50 with a standard deviation

of 15. Lebo plans to present the same questionnaire to a sample of workers from

small companies to determine whether her suspicion is true.

Calculate the effect

size. After making the appropriate calculations, what does she find?

The effective difference between the

motivation level for small companies and those for large companies is - - - -

-.

Lebo, a research psychologist, suspects that the addition of

certain food supplements to the diet of elderly people will reduce the decline

in cognitive functioning that comes about because of aging. She decides to test

this using a neuropsychological test that measure perceptual speed (the NPS

test). It is known that the distribution of scores on this test is

approximately normal and that a mean of µ=50 and a standard deviation of σ=15

was found in the population of persons older than 65.

To investigate her hypothesis, Lebo obtains a random sample

of n=100 persons older than 65. Each member of this sample is given a daily

dose of supplements over a period of six months. At the end of this time, each

person is tested on the NPS test and a mean of x¯ = 58.4 and standard deviation

of s = 16.8 is found. She plans to test the hypothesis at α = 0.05.

The sampling distribution of means refers to:

Lebo claims that workers in large companies are less work

motivated than workers in small companies. In a previous study involving all

large companies in South Africa, it was found that the average workers’

motivation score on a work motivation questionnaire (where a higher score

indicates a higher level of work motivation) was 50 with a standard deviation

of 15. Lebo plans to present the same questionnaire to a sample of workers from

small companies to determine whether her suspicion is true.

After Lebo collected the

responses on the work motivation questionnaire for an appropriate sample of 100

workers from small companies, she calculates the following sample parameters:

        Sample

size: n = 100

        Mean

motivation score for small companies:

        Standard

deviation of the motivation score for small companies: s = 12.5

Since the mean and standard

deviation for large companies are given (as 50 and 15 respectively), Lebo

decides to use a single-sample z-test (i.e. the z

Which of the following are

closest to the calculated value of this statistic?

Which

of the following are advantages of studying statistical methods in psychology?