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# STAT chpt 1

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

biased sampling method | a sampling method that produces data that systematically differ from the sampled population. |

cluster sample | a sample obtained by stratifying the population, or sampling frame, and then selecting some or all of the items from some, but not all, of the strata. |

continuous variable | a quantitative variable that can assume an uncountable number of values. |

data | the set of values collected from the variable from each of the elements that belong to the sample. |

data value | the value of the variable associated with one element of a population or sample. This value may be a number, a word, or a symbol. |

discrete variable | a quantitative variable that can assume a countable number of values. |

experiment | a planned activity whose results yield a set of data. |

finite population | a population whose membership can or could be physically listed. |

infinite population | a population whose membership is unlimited. |

judgment samples | samples that are selected on the basis of being judged “typical.” |

multistage random sampling | a sample design in which the elements of the sampling frame are subdivided and the sample is chosen in more than one stage. |

nominal variable | a qualitative variable that characterizes (or describes, or names) an element of a population. |

ordinal variable | a qualitative variable that incorporates an ordered position, or ranking. |

parameter | a numerical value summarizing all the data of an entire population. |

population | a collection, or set, of individuals, objects, or events whose properties are to be analyzed. |

probability samples | samples in which the elements to be selected are drawn on the basis of probability. Each element in a population has a certain probability of being selected as part of the sample. |

proportional stratified sample | a sample obtained by stratifying the population, or sampling frame, and then selecting a number of items in proportion to the size of the strata from each strata by means of a simple random sampling technique. |

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

quantitative (or numerical) variable | a variable that quantifies an element of a population. |

sample | a subset of a population. |

sampling frame | a list, or set, of the elements belonging to the population from which the sample will be drawn. |

simple random sample | a sample selected in such a way that every element in the population or sampling frame has an equal probability of being chosen. Equivalently, all samples of size n have an equal chance of being selected. |

statistic | a numerical value summarizing the sample data. |

statistics | the science of collecting, describing, and interpreting data. |

systematic sample | a sample in which every kth item of the sampling frame is selected, starting from a first element, which is randomly selected from the first k elements. |

variable | a characteristic of interest about each individual element of a population or sample. |

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empire2311