Chapter 7 Two Sample t-test Dependent t-test
Chapter 7 Two Sample t-test
Dependent t-test
Hypothesis Testing Research hypothesis of relationship Statistical null hypothesis Alternative hypothesis Obtain data Make decision based on probability
Dependent t-test Example Pre/Post Brother/Sister Parent/Child Time1/Time2
TWO groups ONLY DEPENDENT
Null Hypothesis (Ho)
Post Pre
Lo
Hi Post – Pre = 0
Alternative Hypothesis (H1)
Pre
Post
Lo
Hi Post – Pre ≠ 0
Dependent t-test Example Are the means statistically significant? Pre N = 100
Post
Is there a relation between time and curl-up scores?
N = 100
M = 59.6
M = 71.8
S = 12.4
S = 11.7
t = 20.36 df = 99 p < .001 Critical t ≈1.99
SPSS Example Steps/week
Dependent t-test
Hypothesis Testing Research hypothesis of relationship Statistical null hypothesis Alternative hypothesis Obtain data Make decision based on probability
Dependent t-test Example Pre/Post Brother/Sister Parent/Child Time1/Time2
TWO groups ONLY DEPENDENT
Null Hypothesis (Ho)
Post Pre
Lo
Hi Post – Pre = 0
Alternative Hypothesis (H1)
Pre
Post
Lo
Hi Post – Pre ≠ 0
Dependent t-test Example Are the means statistically significant? Pre N = 100
Post
Is there a relation between time and curl-up scores?
N = 100
M = 59.6
M = 71.8
S = 12.4
S = 11.7
t = 20.36 df = 99 p < .001 Critical t ≈1.99
SPSS Example Steps/week
