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# exam #2

### psych 105

Term | Definition |
---|---|

what does the symbol "N" stand for? | the number of people in your sample |

what is frequency? | the number of times a score occurs |

what is the symbol for frequency? | f |

distribution | a general term for any organized set of data |

what are distributions used for? | reporting data and to determine if things are actually different |

simple frequency distribution | shows the number of times each score occurs in a set of data |

steps to make a frequency table | 1. make a list of each value from lowest to highest 2. go one by one through each score and tally each time it's repeated 3. make a table representing every time each value is used 4. find the percentage of scores for each value |

in a frequency distribution, the sum of the frequencies is always... | N |

what is cumulative frequency (cumulative f.)? | the number of scores up to that point |

what is relative frequency (relative f.)? | the total number of scores at that frequency that divides the total number of scores in a data set |

what is a cumulative percentage? | the percentage of scores up to that point |

percentiles | the percent of all scores in the data that are at or below the score |

formula for finding the percentile of a known cumulative frequency | percentile/N x 100 |

what are percentiles usually used for? | determining where someone falls in relation to others |

what does a frequency distribution graph show? | the scores on the X axis and their frequencies on the Y axis |

the type of measurement scale, whether it be nominal, ordinal, interval, ratio, etc.) determines whether we use... | a bar graph, histogram, or a polygon |

nominal or ordinal scores are graphed using a... | bar graph |

small ratio or interval scales are graphed using a... | histogram |

large ratio or interval scales are graphed using a... | (frequency) polygon |

when do you create a bar graph? (hint: something is in one group or the next) | when the X variable is discrete |

when you are creating a bar graph, histogram, or polygon... | consider the scale of measurement of scores on the X axis |