# ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern): Questions 156 - 159 of 253

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## Question 156

### Question

MCQ▾A fan manufacturing company needs to know the average amount of time it takes to install a fan. A technique installs it in 64 different houses and the average time of installation is 42 minutes. The calculated standard deviation is 5 minutes. Then 95 % confidence interval foethe mean installation time is

### Choices

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

a. | ||

b. | 42 + 1.225 | |

c. | ||

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

## Question 157

### Question

MCQ▾Suppose are the unbiased estimators of with Efficiencies and respectively. and is the correlation coefficient between them. Then

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 158

### Question

MCQ▾The hypothesis is known as

### Choices

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

a. | The hypothesis is known as Composite Hypothesis | |

b. | Simple Hypothesis | |

c. | Null Hypothesis | |

d. | Alternative Hypothesis |

## Question 159

### Question

MCQ▾The Indian Government wants the information of children per family. It takes a random sample of 40 families and the numbers of children in the selected families are

1 | 2 | 1 | 2 |

1 | 1 | 1 | 1 |

5 | 4 | 3 | 4 |

1 | 0 | 1 | 2 |

1 | 0 | 3 | 0 |

0 | 0 | 2 | 2 |

5 | 3 | 1 | 0 |

8 | 1 | 0 | 1 |

2 | 1 | 1 | 5 |

2 | 1 | 2 | 3 |

Calculated standard deviation is σ = 1.95. Obtain the 90 % confidence interval for the mean number of children per family in India

### Choices

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

a. | ||

b. | ||

c. | ||

d. |