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# Research 1

### Statistics Review

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

Descriptive statistics that represent averages or scores that are representative of a distribution; includes mean, median, mode | Central Tendency |

A nonparametric test applied to nominal data, comparing observed frequencies within categories to frequencies by chance is? | Chi Square Test |

Measure of central tendency that is the "average" | Mean |

Measure of central tendency that is the "middle" score | Median |

Measure of central tendency that is the most common. | Mode |

The variation from the central tendency is know as the? | Variance |

A descriptive statistic reflecting the variability or dispersion of scores around the mean | Standard Deviation |

A statement of no difference or no relationship between variables is a ? | Null Hypothesis |

The type of error in which one states that there is a difference between variables when in fact there isnt. | Type 1 error |

The type of error in which one states that there isnt a difference between variables when in fact there is. | Type 2 error |

The difference between an observed statistic from a sample and the population parameter refers to what? | Sampling Error |

Stating that there is no difference between variables means one has accepted or rejected the null hypothesis? | Accepted |

Stating that there is a difference between variables means one has accepted or rejected the null hypothesis? | Rejected |

This test is used with nominal data for a small unmatched sample. | Fischer's exact test |

This test is used with nominal data for a small matched sample. | Sign test |

This test is used with nominal data for a large unmatched sample. | Chi Square test |

This test is used with nominal data for a large matched sample. | McNemar's Test |

This test is used with ordinal data when doing one comparison between two groups in an unmatched sample. | Mann-Whitney U or median test |

This test is used with ordinal data when doing one comparison between two groups in a matched sample. | Wilcox matched-pairs signed ranks test |

This test is used with ordinal data when doing more than one comparison between more than two groups in an unmatched sample. | Kruskai-Wallis 1 way ANOVA |

This test is used with ordinal data when doing more than one comparison between more than two groups in a matched sample. | Friedman 2-way ANOVA |

A parametric test for comparing two means in unmatched groups. | T-test |

A parametric test for comparing two means in matched(correlated) groups. | Paired T-test |

If an instrument is capable of measuring a variable with consistency it is said to have? | Test-retest reliability |

The stability of data recorded by one individual across two or more trials is know as? | Intrarater reliability |

Concerns with variation between two or more raters who measure the same group of subjects is know as? | Interrater reliability |

The extent to which items measure various aspects of the same characteristic and nothing else is know as? | Internal consistency |

When defining error, X=? | Observed score |

When defining error, T=? | True Score |

When defining error, E=? | the error component |

What is the formula for the observed score(X) | X=T±E |

What is the reliability coefficient? | T/(T+E) |

Poor reliability = | ≤.50 |

Moderate reliability = | .50-.75 |

Good reliability = | ≥.75 |

This is a reliability measure of internal consistency based on dividing the items on an instrument into two halves and correlating the results. | Split-half reliability |

This test is used with continuous data when doing one comparison between two groups in an unmatched sample. | T-Test |

This test is used with continuous data when doing one comparison between two groups in a matched sample. | Matched T-Test |

This test is used with continuous data when doing more than one comparison between more than two groups in an unmatched sample. | F-test for analysis of variance with blocking for analysis of covariance. |

This test is used with continuous data when doing more than one comparison between more than two groups in a matched sample. | F-test for analysis of variance followed by pair-wise comparison |

Test used for ordinal data with no linear relationship. | Spearmans rho or kendalls tau |

test used for continuous data with a linear relationship. | Pearsons correlation coefficient |

Created by:
txst fall 2008