What is the purpose of testing whether [31 = 0? O The purpose of testing whether ,61 = 0 is to determine whether or not the mean of the x values is equal to the mean of the y values. 0 The purpose of testing whether ,61 = 0 is to determine whether or not there is a significant relationship between x and y. 0 The purpose of testing whether ,61 = 0 is to determine whether or not the regression line provides a good fit for the data. 0 The purpose of testing whether 31 = 0 is to determine whether or not there is a cause-and-effect relationship between x and y. If we reject ,81 = 0, does it imply a good fit? 0 Rejecting = 0 does not necessarily imply a good t. For example, if = 0 is rejected and r2 is high, there is a 1 1 statistically significant relationship between x and y but the fit is not very good. 0 Rejecting ,8, = 0 always implies a good t. If ,61 = 0 is rejected, there is a statistically signicant relationship between x and 3/ which always implies a good t. O Rejecting = 0 does not necessarily imply a good t. For example, if = 0 is rejected and r2 is low, there is a statistically 1 1 significant relationship between x and y but the fit is not very good. 0 Rejecting = 0 never implies a good fit. If = 0 is rejected, there is not a statistically signicant relationship between X 1 1 and y which never implies a good t