# Statistics & Research Methods-Measures of Variation (CBSE-NET (UGC) Psychology (Paper-II & Paper-III)): Questions 12 - 15 of 15

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## Question number: 12

» Statistics & Research Methods » Measures of Variation

MCQ▾

### Question

A coefficient of correlation is an index of the

### Choices

Choice (4) Response

a.

strength of the relationship between two things.

b.

degree to which one variable influences another.

c.

all of the above.

d.

way in which one event may cause another event.

## Passage

Industrial psychologist wanted to study the job efficiency of the company executives in relation to MBA marks, selection test scores, evaluation score at the end of inhouse training. Job efficiency correlated with MBA marks (r = 0.40), selection test scores (r = 0.50) and the evaluation scores at the end of inhouse training (r = 0.60). All the three correlation were statistically significant. The multiple regression was computed using job efficiency as the criterion and the other three variables as the predictors. The three Predictors explained 56.25 percent of variance in the job efficiency. The industrial psychologist further thought that the communication skills assessment would enhance the predictability of-job efficiency. As such the communication skills of the respondents were also assessed, which correlated with job efficiency by 0.35, again a statistically significant value. However when communication skills were added as the fourth predictor in the multiple regression, the change in (squared multiple correlation) was found to be insignificant. (Paper - 3 July)

## Question number: 13 (1 of 2 Based on Passage) Show Passage

» Statistics & Research Methods » Measures of Variation

Appeared in Year: 2016

MCQ▾

### Question

What would be the multiple correlation between the job efficiency and the three predictors (MBA marks, selection test scores, and the evaluation scores at the end of inhouse training)?

### Choices

Choice (4) Response

a.

b.

0.65

c.

0.5

d.

0.75

## Question number: 14 (2 of 2 Based on Passage) Show Passage

» Statistics & Research Methods » Measures of Variation

Appeared in Year: 2016

MCQ▾

### Question

What percent of variance in job efficiency is explained by evaluation scores at the end of training?

### Choices

Choice (4) Response

a.

40 percent

b.

60 percent

c.

36 percent

d.

64 percent

## Passage

A researcher working in the area of human intelligence wanted to develop a new verbal test of intelligence. For this purpose, he wrote 200 objective multiple-choice items. Each item had four alternatives, one of which was right and the three remaining ones were wrong. He administered this initial version to a sample of 400 subjects. Using P27 and P73 as the cut-off points, he obtained two groups – Low Scoring and high scoring respectively. The item difficulty index and the item discrimination index were computed for 200 items. To assess whether each item significantly discriminates between Low scoring and High scoring groups, appropriate statistical significance tests were also employed. This item analysis process retained 150 items. The final version of 150 items was administered to a fresh sample of 750 subjects. The appropriate measures of internal consistency reliability were obtained. The test norms were developed using normalized T scores (mean = 100, SD = 20) and the Wechsler type deviation IQ scores. To assess the dimensionality of verbal intelligence, the researcher also carried out the factor analysis of item scores.

## Question number: 15 (1 of 1 Based on Passage) Show Passage

» Statistics & Research Methods » Measures of Variation

Appeared in Year: 2017

MCQ▾

### Question

Which one of the following test of statistical significance can be employed in the above study to evaluate whether item significantly discriminates between the Low scoring and High scoring groups?

### Choices

Choice (4) Response

a.

Chi-square

b.

Point-biserial correlation

c.

t test

d.

Biserial correlation

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