' ..,,..,, A research studied the correlation between physical characteristics of sisters and brothers. Here are data on the heights (in inches) of 11 adult pairs. Brothers are:( 61, 63, 70, 71, 73, 62, 75, 68, 65, 69, 74) Sisters are: ( 50, 66, 68, 65, 66, 51, 66, 58, 62, 67, 73 ) Is there evidence of a signicant linear association between physical characteristics of sisters and brothers ( u = 0.05 level)? Perform inference for simple linear regression among brother heights and sister heights. ' ' We fail to reject the null hypothesis. 0 We reject the null hypothesis.We have strong evidence at the a level 0.05 that students who have engaged in community service are on the average more attached to their friends. ' We do not have enough information. \\ Assumptions for our tests are not met because both sample sizes are not the same. \\ Our assumptions are not met because one of the sample sizes is 11 smaller than 30