Week 10 - Paired Sample t-test

Question 1

Answer 1

The scores being evaluated ARE RELATED. From the same person.

**STEP 1 **(below).
Calculate M and s of the last column.

Question 2

Score control
=
-44 lbs

Negative mean they scored lower post-manipulation. Or they lost weight.

Answer 2

Ho = no difference between control and experimental.

Need to create DISTRIBUTION OF MEAN DIFFERENCES BASED ON OUR Ho.

Question 3

Answer 3

Question 4

Mean = 0 (because everyone gets pulled from the SAME POPULATION)

Estimate ‘s’ standard error from the population differnce scores based on the sample

Answer 4

Question 5

CONCLUSIONS

Answer 5

CONCLUSIONS

Question 6

HOW IT’S DONE:

PAIRED SAMPLE t-test:

ORDER EFFECTS
COUNTER-BALANCING

Answer 6

Q : Do mothers show different levels of oxytocin when interacting wth their own toddlers vs. unfamiliar toddlers?

PAIRED-SAMPLE T-TEST: used tp compare 2 means for a WITHIN-IN group design.

Use DISTRIBUTION OF MEAN DIFFERENCES.

Question 7

STEP 1:

Answer 7

STEP 2:

Question 8

STEP 3:

Answer 8

STEP 3:

Question 9

STEP 3

Answer 9

STEP 4:

Question 10

STEP 5:

Answer 10

STEP 6:

Question 11

Answer 11

CONFIDENCE INTERVALS:

Question 12

INTERPRETATION OF Confidence Intervals:

Answer 12

Effect Size / Cohen d’s