Research + EBP quiz 3

Measures of control tendency

1. Mean

2. Median

3. Mode

Mean

Average of all scores

Median

Middle number in a sorted list

Formula for median if *odd

(N+1)/2

Formula for median if *even

(N+1)/2 = ANS

ANS+Number to the right/2

Mode

Occurs most frequent

Measures of dispersion

1. Standard deviation

2. Variance

Variance

Measure of variability of a group of scores around the group mean

Standard deviation

On average, how far the average deviation is from the mean, the square root of
variance

Sample

N-1

Types of error

1. Sampling

2. Standard error of the mean

Sampling error

The expected variation among the means of different data sets

Standard error of the mean

Standard deviation of the mean

SE Calculation

Sample standard deviation/ SR of N

Confidence Intervals

Gives you a range of scores (95%) that the sample mean can flucate in

Inferential stats

The likelihood, or probability

Tests of significance

Determine whether group means are significantly different from one another/are attributable to chance

Test of significance gives you what

A P value from 0-1

Types of statistical tests:

1. Chi-squared

2. T-Test independent groups

3. Dependent T test for paired groups

4. One-way Anova

5. Two-way Anova

Null hypothesis

No difference

Alternate hypothesis

Difference