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# Research 1

### Statistics Review

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