What is the correlation coefficient for this data set if R^2=0.3481 and y=25.03x+76.86?

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?

If the class creates a histogram of the data in table, how many students are in the range 12cm to 13.9 cm

If the numbers below were ordered from least to greatest, which number could you use to replace the blank? 0.20,2/5 □ , 3/4,8/10