# Research Methods and Statistics-Experimental Designs [GATE (Graduate Aptitude Test in Engineering) Psychology]: Questions 1 - 4 of 27

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## Question 1

Appeared in Year: *2013*

### Question MCQ▾

What would be the degrees of freedom for error variance in a five group randomized ANOVA, with twelve subjects per group? (December)

### Choices

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

a. | 60 | |

b. | 55 | |

c. | 59 | |

d. | 54 |

### Passage

A researcher wanted to study the effect of a specific drug on the activity of rats. He suspected if the effect of the drug is moderated by temperature. He varied drug dosage (A) at three levels-no drug (placebo) , low drug dosage (5 mg/kg body-weight) and high drug dosage (10 mg/kg bodyweight) . He varied temperature (B) at two levels - 25 degree Celsius and 39 degree Celsius. Fifteen rats were randomly assigned to each of the six groups. The activity scores for each rate were obtained through activity wheel. The cell means and standard deviations for activity scores were obtained for the six cells. All the cells had comparable standard deviations. A suitable analysis of variance was carried out using the activity scores as the dependent variable. One of the interesting finding in this research was that the F ratio defined as “MSA B/MSE” was statistically significant at . 01 level.

(June 2014)

## Question 2 (1 of 1 Based on Passage)

Appeared in Year: *2014*

### Question MCQ▾

From the above paragraph, it can be inferred that the assumption of homogeneity of variance

### Choices

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

a. | cannot be evaluated in the absence of relevant data | |

b. | has been violated | |

c. | suggests square root transformation of data in this case. | |

d. | has been satisfied |

### Passage

A researcher wanted to study the effect of a specific drug on the activity of rats. He suspected if the effect of the drug is moderated by temperature. He varied drug dosage (A) at three levels-no drug (placebo) , low drug dosage (5 mg/kg body-weight) and high drug dosage (10 mg/kg bodyweight) . He varied temperature (B) at two levels – 25 degree Celsius and 39 degree Celsius. Fifteen rats were randomly assigned to each of the six groups. The activity scores for each rate were obtained through activity wheel. The cell means and standard deviations for activity scores were obtained for the six cells. All the cells had comparable standard deviations. A suitable analysis of variance was carried out using the activity scores as the dependent variable. One of the interesting finding in this research was that the F ratio defined as ‘MSA B/MSE’ was statistically significant at . 01 level.

(June 2014)

## Question 3 (1 of 4 Based on Passage)

### Question MCQ▾

Since the F ratio, defined as ‘MSA B/MSE’ , is significant, it would be desirable to carry out

### Choices

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

a. | simple effects analysis | |

b. | compute 3 2 multivariate ANOVA | |

c. | post-hoc comparison for the two levels of B. | |

d. | post-hoc comparisons for the three levels of A |

## Question 4 (2 of 4 Based on Passage)

### Question MCQ▾

From the significant F ratio, ‘MSA B/MSE’ , it can be inferred that

### Choices

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

a. | the main effect of drug dosage is significant | |

b. | the main effect of temperature is significant | |

c. | the effect of drug dosage is moderated by temperature | |

d. | the main effect of drug dosage, the main effect of temperature, and the interaction effect of the two, all are significant. |