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# Statistics - Exam 4

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

Probability of rejecting the null hypothesis when in fact the null hypothesis is true | level of significance |

Denoted by a (alpha) | level of significance |

If a (alpha) is not given use: | .05 |

_______ is a test or statement about a population parameter such as mean, and it must contain the condition of equality. | null hypothesis |

______ is denoted by H0 | null hypothesis |

_______ is a test or statement about a population parameter and tests for a significant change | alternative hypothesis |

_______ is denoted by H1 | alternative hypothesis |

Psychology, education, sociology and athletics are more likely to use a _______ alpha | larger |

Medical professions and engineering are more likely to use a _______ alpha | smaller |

Set of values of the test statistic that leads to the rejection of the null hypothesis | critical region |

Value that separates the critical region from the non-critical region | critical value |

Value computed from the sample data ; used to determine whether to reject the null hypothesis or not | test statistic |

Probability of getting a sample statistic (such as the mean) or more extreme value in the direction of the alternative hypothesis when the null hypothesis is true | p-value |

if p-value is less than or equal to alpha then ________ | reject the null hypothesis |

if p-value is greater than alpha then ________ | do not reject the null hypothesis |

A very small p-value indicates a ________ of the null hypothesis | strong rejection |

complete collection of people, objects, scores, etc. to studied | population |

any sub collection of data drawn from a population | sample |

value measuring some characteristic of a population | parameter |

value measuring some characteristic of a sample | statistic |

proportion of a population symbol | p |

mean of a population symbol | µ (mu) |

variance of a population symbol | σ² |

standard deviation of a population symbol | σ |

variance of a sample symbol | s² |

standard deviation of a sample symbol | s |

mean of a sample symbol | x bar |

proportion of a sample symbol | p hat |

What tells the researcher how confident he or she is with the final conclusion? | p-value |