Page 82 - Quantitative Data Analysis

Quantitative Data Analysis
Simply Explained Using SPSS

• This design is good as it allows us to measure change, did the
treatment significantly increase over time.

Dependent ‘t’-test
• Questions answered:

– Is one group mean significantly different from, significantly less
than, or significantly greater than another group mean, when the
two groups are matched or dependent on each other?

– Is one group mean significantly different over time (pre/post test,
before and after)?

• Test for quantitative data

Hypotheses

Null Hypothesis: H 0 :μ 1 = μ 2or H 0 : μ 1 − μ 2 = 0

Alternative Hypothesis: H 1 :μ 1 = μ 2 orH 1 : μ 1 − μ 2 ≠ 0

Formula

̅

( )
√
̅
Where the mean of the difference scores, SD is is the standard
deviation of the difference scores, n is the sample size.

The Theory and Applications of Statistical Inferences 66