# Statistics & Research Methods (CBSE-NET (Based on NTA-UGC) Psychology (Paper-II)): Questions 121 - 126 of 184

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## Passage

A psychologist wanted to develop a numerical ability test for the student population. She wrote eighty multiple choice items, each item with five alternatives. The item analysis was carried out by finding discrimination index and item-remainder correlation for each item. Sixty items were retained in item analysis.

The new version, with finally retained sixty items was administered to a new sample (N = 400) twice with a time gap of eight weeks. The test-retest correlation was found to be 0.22, significant at. 01 level. The data obtained at the first administration of the sixty item version was also used for computing split-half reliability. The correlation between scores based on odd items and the scores based on even items was found to be 0.60. The split-half reliability coefficient was obtained after applying Spearman-Brown correction.

The scores obtained by the students were correlated with their marks in Mathematics in their annual examination which took place three months after the data collection. The product-moment correlation of 0.6 was obtained between test scores and mathematics. Norms were developed for the test. The normative sample yielded a mean of 40 and standard deviation of 8. The data were found to be normally distributed. As norms, percentile ranks were obtained.

(June 2014)

## Question number: 121 (1 of 1 Based on Passage) Show Passage

» Statistics & Research Methods » Measures of Variation

MCQ▾

### Question

Which of the following correlation is suitable while computing item-remainder correlation in the above analysis?

### Choices

Choice (4) Response

a.

Spearman rank difference correlation

b.

Phi-coefficient

c.

Multiple correlation

d.

Point-biserial correlation

## Question number: 122

» Statistics & Research Methods » Inferential Statistics

MCQ▾

### Question

Identical twins are likely to have almost identical IQs. In contrast, parents and their children have IQs that are only generally similar. The correlation between IQs of parents and children is. 35; that between identical twins is ________.

### Choices

Choice (4) Response

a.

0.35

b.

0.70

c.

0.85

d.

0.86

## Question number: 123

» Statistics & Research Methods » Application of Statistics in Psychology

MCQ▾

### Question

Statistics can be classified as ________.

### Choices

Choice (4) Response

a.

Descriptive

b.

A and B

c.

Inferential

d.

Hypothetical

## Question number: 124

» Statistics & Research Methods » Inferential Statistics

MCQ▾

### Question

The ________ statistics is used for decision making for generalizing from small samples, and for drawing conclusions.

### Choices

Choice (4) Response

a.

Parametric

b.

Descriptive

c.

Inferential

d.

Question does not provide sufficient data or is vague

## Question number: 125

» Statistics & Research Methods » Inferential Statistics

MCQ▾

### Question

Which of the following is an advantage of “Correlation method”.

### Choices

Choice (4) Response

a.

Relationship may be coincidental

b.

Cause-and-effect relationship cannot be confirmed

c.

Demonstrates the existence of relationship

d.

Little or no control is possible

## Question number: 126

» Statistics & Research Methods » Factor Analysis

Appeared in Year: 2014

MCQ▾

### Question

A study employed two groups, matched on intelligence, each group with 30 subjects. Each subject was required to learn a list of CVC trigrams and the number of trials required to learn the list was the dependent variable. What would be the degrees of freedom if a suitable t test is used to evaluate the mean difference? (December)

### Choices

Choice (4) Response

a.

60

b.

58

c.

30

d.

29

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