A set of data has mean 70 and standard deviation 4. find the z score of the value 66

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Match the one-to-one functions with their inverse functions.