but Dean than ! it mean d. Determine if the correlation stablishes causation or not. EXPLAIN WHY. e. Change one of the compared variable samples in such way that the correlation for sure stablishes causation. 10pts 9 A survey of 200 students provides a sample mean of 7.10 hours worked and they know from previous studies that the standard deviation of this variable is 5 hours. 10pts a. What is the S.E. interval (+/- S.E.M) based on this sample? b. What is the 95% confidence interval (+/- 95%C.I.) based on this sample? c. Graph your results using a histogram