# ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 425 - 428 of 472

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## Question 425

### Question

MCQ▾Let the random variable where and ∑ = and . Then which of the following statement is correct regarding the value of?

### Choices

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

a. | is a matrix. | |

b. | is a matrix. | |

c. | is a matrix. | |

d. | Question does not provide sufficient data or is vague |

## Question 426

### Question

MCQ▾The value of , chi square statistic of the given data set is ________.

### Choices

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

a. | ||

b. | ||

c. | 9.375 | |

d. | None of the above |

## Question 427

### Question

MCQ▾Which of the following statement is/are not correct?

### Choices

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

a. | A frequency polygon is a closed figure that is formed by joining the top midpoints of all the rectangles of a histogram using a free hand. | |

b. | A frequency curve is a closed figure that is formed by joining the top midpoints of all the rectangles of a histogram using straight line. | |

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

d. | Question does not provide sufficient data or is vague |

## Question 428

### Question

MCQ▾What is the correlation between the following z-scores?

X | Y |

0.1 | 0.2 |

0.6 | 0.4 |

-0.3 | -1.0 |

-0.5 | -0.3 |

0.8 | 0.7 |

### Choices

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

a. | ||

b. | 0.425 | |

c. | ||

d. | Question does not provide sufficient data or is vague |