# Stats

rename
Updated
2007-02-13 22:20

## Definitions

Definition | Word |
---|---|

The science of collecting, organization, and interpretation of data. | Statistics |

Collection, presentation and description of sample data. Things that describe the sample. Ex. All heights would be 68-69” tall. | Descriptive Stats |

Making decisions and draw conclusions about populations. | Inferential Stats |

The entire collection of objects or subjects. | Population |

A part/subset of the population | Sample |

A planned activity where the experimenter has control to impose a treatment. | Experiment |

After the fact data collection. No imposed treatment. | Survey |

Represented with a Greek letter. (ex. Alpha sigma beta cal) Population summaries (numerical) | Parameter |

A variable that categorizes or describes an element of a population. | Qualitative |

Attribute, categorical, USUALLY non-numerical, arithmetic is useless with this | Quality |

Numerical in nature, arithmetic is useful (ex. Height, weight, age) | Quantitative |

Qualitative > Variable that order is implied. Ex. Rank in a race, small medium large, military rankings | Ordinal |

Qualitative > Variable that order is not implied, hair color | Nominal |

Quantitative > Numerical value that takes on packets of numbers (count) | Discrete Variable |

Quantitative > All numbers in-between, like the real number system (measurement) | Continuous Variable |

The Number of standard deviations above or below the mean on a normal curve. | Z-score |

The data value such that at most k% o the data falls below. | Percentile |