# Correlation and Regression (CA Foundation Maths, Statictics, Logic, and Reasoning): Questions 31 - 36 of 42

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## Question number: 31

» Correlation and Regression

### Question

The difference between the observed value and the estimated value in regression analysis is known as

### Choices

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

a. | Error | |

b. | Error or Residue | |

c. | Residue | |

d. | Deviation |

## Question number: 32

» Correlation and Regression

### Question

Regression analysis is concerned with

### Choices

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

a. | Establishing a mathematical relationship between two variables | |

b. | Predicting the value of the dependent variable for a given value of the independent Variable | |

c. | Measuring the extent of association between two variables | |

d. | Both a. and b. are correct |

## Question number: 33

» Correlation and Regression

### Question

For finding correlation between two attributes, we consider

### Choices

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

a. | Scatter diagram | |

b. | Pearson’s correlation coefficient | |

c. | Spearman’s rank correlation coefficient | |

d. | Coefficient of concurrent deviations. |

## Question number: 34

» Correlation and Regression

### Question

The two lines of regression become identical when### Choices

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

a. | r = –1 | |

b. | r = 0 | |

c. | r = 1 or -1 | |

d. | r = 1 |

## Question number: 35

» Correlation and Regression

### Question

If the coefficient of correlation between two variables is 0.7 then the percentage of variation unaccounted for is

### Choices

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

a. | 51% | |

b. | 49% | |

c. | 70% | |

d. | 30% |

## Question number: 36

» Correlation and Regression

### Question

What are the limits of the coefficient of concurrent deviations?

### Choices

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

a. | Between –1 and 1, the limiting values inclusive | |

b. | Between –1 and 0, including the limiting values | |

c. | No limit | |

d. | Between 0 and 1, including the limiting values |