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# MMW unit IV

### Measures of central location and Measures of Dispersion

Question | Answer |
---|---|

It represents the value of where data observations tend to cluster; represents entire mass of data by a single value. | Measures of Central Location. |

Which is a very sensitive measure that can only be used on interval or ratio data? | Mean |

If two sets of data have the same median, then the data must be the same. True or False? | False |

It is the measure of dispersion that depends only on the two most extreme values of data. | Range |

It is a measure that only considers order and is unaffected by extreme scores, also called the middle score. | Median |

It can be used for any levels of measurements; measures the most frequently occurring value in a data set. | Mode |

It describes how spread the data are and measures the variation of data values among themselves. | Measures of dispersion |

It a measure of dispersion that takes the difference between the greatest data and the least data value. | Range |

It makes use individual amount that each data values deviate from the mean. | Standard deviation |

When the data values have equal frequency the mode... | does not exist |

When the data sets have two most frequently occurring values, it is called? | Bimodal |

Class A has the mean of is 51.38, SD: 4.03 and sample variance of 16.24.. Whereas class B has a mean of 53, SD: 8.64, and sample variance of 74.65. Which class produced more consistent results? | Class A |

If the standard deviation of a mean is low it means that the mean is? | Reliable |

Data sets with three or more frequent data values is called? | Multimodal |

If the standard deviation is closest to zero there is a? | lower data variability and a more reliable mean. |

If the standard deviation is the variation in the data and the mean is? | Data variation is high; Mean is less accurate. |

What is the mean of this data set: 48, 51, 50, 47, 51, 49, 58, 57? | 51.38 |

What is the mean of this data 44, 54, 58, 61, 66, 40, 51, 50? | 53 |

Calculate the range of this set 48, 51, 50, 47, 51, 49, 58, 57. | 11 |

Calculate the range pf this set 44, 54, 58, 61, 66, 40, 51, 50. | 26 |

It is a measure of dispersion that is the square of standard deviation. What is it called? | Variance |

Calculate the standard deviation of this sample 48, 51, 50, 47, 51, 49, 58, 57. | 4.03 |

Calculate the standard deviation of this population 1, 2, 5, 7, 8. | 7.44 |