You are a developmental psychologist and are interested in how math anxiety changes with age. You go into an elementary school and measure the math anxiety of 15 children who are in the 2^nd grade. Three years later you go back and measure these same children's math anxiety levels when they are in 5^th grade.

Question 31 (3 points)

This type of study is _____________, which means that you _____________.

Question 31 options:

	Correlational, can infer causality
	Experimental, can infer causality
	Correlational, cannot infer causality
	Experimental, cannot infer causality

Question 32 (3 points)

What is the appropriate test to look to see if the amount of math anxiety a student has in 2nd grade is related to amount of math anxiety that the same student has in 5th grade?

Question 32 options:

	Spearman correlation
	t test
	z-test
	Pearson correlation

Question 33 (3 points)

You enter the data in Jamovi and get this report. What is the value of r?

Correlation Matrix
		2nd Grade	5th Grade
2nd Grade	Pearson's r
	p-value
5th Grade	Pearson's r	0.683
	p-value	0.005

Question 33 options:

	.005
	Unable to determine
	.68
	-.68

Question 34 (3 points)

What are the degrees of freedom for this study?

Question 34 options:

	14
	15
	13
	30

Question 35 (3 points)

What is the critical value for r in this study?

Question 35 options:

	.482
	.412
	.514
	.426

Question 36 (3 points)

Is this a significant correlation?

Question 36 options:

	Not enough information to decide
	No, but there may not have been enough power.
	Yes
	No

Question 37 (3 points)

Based on this correlational study, you can conclude:

Question 37 options:

	Second graders have less math anxiety than fifth graders
	Getting older causes math anxiety to increase
	Having higher math anxiety is caused by traumatic early childhood experiences.
	Children with higher levels of math anxiety in second grade also tend to have higher levels of math anxiety in fifth grade

Question 38 (3 points)

If you ran a regression analysis on this data you would find this formula for the regression line.

Y'=.55X + 1.66

What 5^th grade math anxiety would you predict if a child had a second grade math anxiety level of 2?

Question 38 options:

	1.10
	2.21
	2.76
	2.00