Chapter 4 Part 2 Practice

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?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

What is the circumference of the pie