# ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 466 - 467 of 472

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## Question number: 466

» Statistical Methods » Non-Parametric Tests » Median

### Question

Which of the following statements is incorrect for calculation of median for Individual series?

**Statement 1:** If the number of observations is odd then median is the observation in the arranged order

**Statement 2:** If the number of observations is even then the median is the mean of and observations in the arranged order.

### Choices

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

a. | Statement 1 and 2 is correct | |

b. | Only Statement 2 is correct | |

c. | Statement 1 and 2 is incorrect | |

d. | Only Statement 1 is correct |

## Question number: 467

» Statistical Methods » Non-Parametric Tests » Mann-Whitney

### Question

A physician is interested in the effect of an anesthetic on reaction times. Two groups are compared, one with (A) and one without (B) taking the anesthetic. Subjects had to react on a simple visual stimulus. Reaction times are not normally distributed in this experiment, so data is analyzed with the Mann-Whitney U-Test for ordinal scaled measurements. The table below shows the rank-ordered data:

Mean RT | Rank | Group |

131 | 1 | B |

135 | 2 | A |

138 | 3.5 | B |

138 | 3.5 | B |

139 | 5 | A |

141 | 6 | B |

142 | 8 | B |

142 | 8 | A |

142 | 8 | B |

143 | 10 | B |

144 | 11 | A |

145 | 12 | B |

156 | 13 | B |

158 | 14 | A |

165 | 15 | A |

167 | 16 | B |

171 | 17 | A |

178 | 18 | A |

191 | 19 | B |

230 | 20 | B |

244 | 21 | A |

245 | 22 | A |

256 | 23 | A |

267 | 24 | A |

268 | 25 | A |

289 | 26 | A |

The Correct conclusion is

### Choices

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

a. |
| |

b. | The anesthetic group shows significantly slower reaction times than the non-anesthetic group | |

c. | The observed value is greater than the Z-value | |

d. | All a. , b. and c. are correct |