Question

	BMI
Subject ID #	Child	Child’s Birth Parent	Child’s Adoptive Parent
1	17	34	19
2	22	19	22
3	28	22	34
4	24	19	27
5	23	28	24
6	19	22	19
7	26	22	29
8	19	24	18
9	25	21	27
10	19	23	21

Part 2: Correlating the children’s BMI with their adoptive parents’ BMI

1. Create a scatter plot between the children’s BMI and their adoptive parents’ BMI. Format the plot into an APA-styled “figure” (see week 1 video for APA figure format). (3 points total: 1 for correct scatter graph type, 1 for correct data, 1 for APA format- figure number and title/caption)

7. Calculate the mean and standard deviation for the adoptive parents’ BMI. (2 points total: 1 for mean and 1 for SD- deduct .5 if the process is correct but result is wrong)

2. Calculate the Z scores for all the data points for the adoptive parents. (1 point for calculating adoptive parents’ Z scores. Deduct .5 for each error in calculation)

3. Calculate the Pearson’s correlation coefficient r between children’s BMI and their adoptive parents’ BMI. Note that the children’s Z scores have been calculated in Part 1 of this scenario. (2 points total: 1 for work, 1 for r value)

4. Explain the direction and strength of the relationship based on the r. (2 points total: 1 for direction, 1 for strength)

5. What is the proportion of shared variance between children’s BMI and their adoptive parents’ BMI? That is, how much of the variance in the children’s BMI can be predicted from their adoptive parents’ BMI? (2 points total: 1 for work, 1 for result)
6. Based on the two r statistics, what would be the answer to the research question of whether children’s BMI is influenced more by nature or nurture? (1 point)

Answer 1

1) Adoptive parents : mean =24

Standard deviation = 5.1855

2) r = 0.5080

3) Direction : Positive Association between two variables.

Strength : Moderate relationship between two Variables.

4) 25.80 % of the variance in the children’s BMI can be predicted from their adoptive parents’ BMI.

5) Children’s BMI is influenced more by Birth parents than Adoptive parents because correlation for birth parents = 0.96 which is greater than Adoptive parents = 0.50

PL??