Use the data in Chapter 15 Data Set 4 to answer the following questions. Compute the correlation coefficient manually.

1 Test for the significance of the correlation coefficient at the .05 level using a two-tailed test between hours of studying and grade.

5 A study was completed that examined the relationship between coffee consumption and level of stress for a group of 50 undergraduates. The correlation was .373, and it was a two-tailed test done at the .01 level of significance. First, is the correlation significant? Second, what’s wrong with the following statement: “As a result of the data collected in this study and our rigorous analyses, we have concluded that if you drink less coffee, you will experience less stress”?
6 Use the data below to answer the questions that follow. Do these calculations manually.