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# Statistics - Exam 2

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

value measuring some characteristic of a population | parameter |

value measuring some characteristic of a sample | statistic |

variance of a sample symbol | s² |

standard deviation of a sample symbol | s |

variance of a population symbol | σ² |

standard deviation of a population symbol | σ |

mean of a sample symbol | x with a line above it |

mean of a population symbol | mu |

process that leads to well defined results called outcomes | probability experiment |

set of all possible outcomes | sample space |

if two events can not occur simultaneously | mutually exclusive |

if one event does not affect the probability of another event | statistically independent |

The 3 approaches to probability are ____________. | classical, relative frequency, subjective |

Use classical approach when __________. | sample space can be listed, randomness (no bias) |

Use relative frequency approach when __________. | sample space cannot be listed, bias exists |

probabilities based on expert opinions | subjective approach |

The 4 conditions of binomial experiments are ____________. | fixed number of trials, trials are independent, probabilities remain the same per trial, 2 outcomes per trial (success & failure) |

number of trials symbol | n |

number of successes in n trials symbol | x (r on calculator) |

probability of success per trial symbol | p |

probability of failure per trial symbol | q |

factorial symbol | ! |

complement of A symbol | A with a line over it |

table that lists all possible values of a random variable (x) along with its corresponding probabilities | discrete probability distribution |

Created by:
K1N1V