# Research Methods and Statistics [GATE (Graduate Aptitude Test in Engineering) Psychology]: Questions 98 - 101 of 320

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## Question 98

### Question

MCQ▾The most widely used measure of correlation is

### Choices

Choice (4) | Response | |
---|---|---|

a. | the Spearman-Brown prophecy formula. | |

b. | the rank-difference correlation coefficient. | |

c. | the Pearson r. | |

d. | Spearman՚s rho. |

## Question 99

### Question

MCQ▾In their search for accurate information and useful theories, psychologists study behavior in many ways. They observe behavior as it unfolds in natural settings, this is known as ________.

### Choices

Choice (4) | Response | |
---|---|---|

a. | Naturalistic observation | |

b. | Correlational method | |

c. | Experimental method | |

d. | Clinical method |

### 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 100 (1 of 1 Based on Passage)

### Question

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

### Choices

Choice (4) | Response | |
---|---|---|

a. | Point-biserial correlation | |

b. | Phi-coefficient | |

c. | Multiple correlation | |

d. | Spearman rank difference correlation |

## Question 101

### Question

MCQ▾________ variable in an experiment might be the response of a person to stimulus, a change in behavior after the administration of a drug, changes in managerial behavior after a new training program has been instituted, a score in a test, a verbal report about an event in the environment.

### Choices

Choice (4) | Response | |
---|---|---|

a. | Dependent | |

b. | Discrete | |

c. | Independent | |

d. | Control |