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# TSHPS PsychStat

### TSHPS Psychology's Statistics Terms

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

Frequency Distribution | A List of scores ordered (often) from lowest to highest. |

Histogram | Graphed frequency distribution. |

The "normal score." | Center of a frequency distribution. |

Mean | The mathematical average of a distribution, obtained by adding the scores and then dividing by the number of scores. |

Median | The middle score in a ranked distribution: half the scores are above it, and half are below it. |

Mode | The most frequently occurring score or scores in a distribution. |

Normal Distribution | The frequency distribution is shaped like a symmetrical bell, with median, mode, and mean all at the peak. |

Skewed Distribution | A distribution that is distorted or skewed. |

Negative Skew | Tail on left, more data on the right than in normal curve, mean skewed to left or lower values. |

Positive Skew | Tail on right. More data on the left than in normal curve. Mean skewed to the right or higher values. |

Range | Difference between the highest and lowest scores in a distribution. |

Standard Deviation | Computed measure of how much scores vary around the mean score of a distribution. |

1 Standard Deviation on Normal Curve | 34% of scores. |

Within 1 SD on NC | 68% of scores . |

2 SD on NC | 47.5% of scores. |

Within 2 SD on NC | 95% of scores. |

3 SD on NC | 49.5% of scores. |

Within 3 SD on NC | 99% of scores. |

Percentages | Comparative statistic that compares a score to perfect score of 100 points. |

Percentile Rank | Comparative statistic that compares a score to other scores in an imaginary group of 100 individuals. |

Inferential Statistics | Statistics that can be used to make a decision or reach a conclusion about data. |

T-Test | A Test that compares the means of 2 groups. |

Anova Test | A Test that compares the means of 3 or more groups. |

Statistical Significance | A statement of likelihood that the difference occurred by chance (p value). Psychology studies must be less than 5% probability of difference occurring by chance. |