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# RFC1 part 3

### Data Analyis Chapters 12-13

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

Mean | average of numbers added together and divided interval |

median | arrange numbers in order the number the middle number is the median for odd, for even add two middle numbers divided by 2 ordinal |

mode | the number that repeats itself, if no number repeats then there is no mode.ordinal nominal |

range | simply the difference between the highest and lowest scores |

quartile deviation | one half of the difference between the upper quartile and the lower quartile. |

variance | defined as the amount of spread among scores. |

standard deviation | square root of the variance of a set of scores. |

normal curve | small # of a's and f's more b's and d's and lots of c's |

skewed distributions | distribution is not normal it is said to be skewed. |

percentile rank | percentage of scores that fall at or below a given score. |

standard scores | calculation that expresses how far an individual student's test score is from the mean |

z score | most basic and most used standard score. how far a score is from the mean. z score = 0 |

t score | used to proved an easier to understand score that is standardized without pluses or minuses and is derived by multiplying the z score by 10 and adding 50 |

Pearson r coefficient (for interval and ratio data) | correlation coefficient is the most propriate measure when the variables to be correlated are expressed as either interval or ration data. |

Spearman Rho | correlate ranked or ordinal data |

stanines | standard scores that divide a distribution into nine parts. |

Frequencies | frequency at which data is collected at regular intervals. This often refers to whatever time of the day or the year in any given length of period. |

type I error | reject the null hypothesis when the null hypothesis is true |

type II error | accept the null hypothesis when the null hypothesis is false |

Hypothesis | an explanation for the occurrence of certain behaviors, phenomena, or events; a prediction of research findings. |

Created by:
hday