1are ONE type of formal null hypothesis test used for D RELATIONSHIPS
t-tests
23 types of t tests
1 sample t test, independant sample t test, and paired sample t test
3comparing 2 groups
D relationships
4used when comparing a sample average to the population average
1 samples t-test
5is there a difference between 2 groups?
independant sample t test
6is there a difference in a group between 2 points in time?
paired sample t test
7No difference between Sample and Population; 2 means are EQUAL; d=0
Null hypothesis
8interpretating t
COMBINES relationship strength and sample size, INCREASES with relationship strength and sample size, LARGER VALUES of t lead to REJECTING Ho
9t>2 is..
significant ; REJECT Ho
10t<2 is.
NOT significant; FAIL to reject Ho
11as t INCREASES...
p DECREASES
12for both 1 and 2 tailed tests, the p-value should be..
LESS than 0.05 to be SIGNIFICANT
131 and 2 tailed tests have DIFFERENT..
ALT hypothesis
14states that one groups mean is HIGHER/LESS than the other group
1 tailed tests ALT HYPOTHESIS
15states that there IS A DIFFERENCE between GROUP MEANS, but does NOT hypothesize if one mean is more/less than the other
2 tailed tests ALT HYPOTHESIS
16degrees of freedom for 1 sample t test
df=N-1