School administrators wonder whether class size and grade achievement are related. A random sample of classes revealed the following data: # of 15 10 students, x 8 20 18 6 Ave grade 85 90 82 80 84 92 The correlation coefficient for the data set is r = - 0.67. Test the significance of the correlation coefficient using a level of significance (alpha) of 0.05 to determine if there is a relationship between the variables. Take a picture of your work and attach it to the question or type your response in the box. HINT: Be sure to include the following steps: Step 1: Write the hypotheses. Step 2: Find the critical values. Step 3: Draw a number line and compare the critical values to the r value. Step 4: Reject Null or Do Not Reject Null? Step 5: Conclusion