Question

A correlation tests whether differences exist between two variables.

Question 1 options:

a) True

b) False

Question 2 (1 point)

You have tested to find whether a relationship exists between hours of sleep the night before an exam and grade on the exam. You have a participant pool of n = 30, df = 28. Your hypothesis is that a significant relationship will exist, where those with more hours of sleep receive higher grades on the exam. This is a directional hypothesis, so you run a one-tailed test, with α = 0.05. You run the numbers and find a correlation of 0.243. The critical value from the t-table is ___________.

Question 2 options:

	a) 2.048
	b) 1.701
	c) 1.697
	d) 2.042

Question 3 (1 point)

A correlation coefficient may be in a range from -1 to +1

Question 3 options:

a) True

b) False

Question 4 (1 point)

You are interested in whether the number of hours spent watching TV is related to weight. Your hypothesis is that the more hours spent watching TV, the higher the weight. You test this hypothesis and find a significant positive correlation of 0.67. Because your correlation is significant, you can conclude that watching TV cause weight gain.

Question 4 options:

a) True

b) False

Question 5 (1 point)

Your professor tells you that there is a relationship between hours students spend studying and the grade on exams. The correlation between exam score and hours spent studying is an example of­­­­­­­­­­­­­­­­­­­­­­­________________.

Question 5 options:

	a) A correlation near zero
	b) a negative correlation
	c) a positive correlation
	d) a correlation near one

Answer 1

Question 1)

Answer)

Correlation tests whether relationship between two variables exists

So answer is false

2)

Answer)

From t table, for 28 degrees of freedom and 0.05 alpha

Critical value is 1.701

3)

Answer)

Yes correlation coefficient range from -1 to 1

Statement is true

-1 to 0 is negative correlation

0 to 1 is positive correlation

And 0 is no correlation