It is believed that animals living in northern regions have shorter appendages than animals living in southern regions. Random samples of birds were selected from each group and wing lengths for birds (in millimeters) were measured. The following table gives summary statistics. Region n Average Standard deviation Northern (N) 30 112.6 1.4 Southern (S) 30 114.1 2.9 Difference (d = N - S) 30 -1.5 1.3 (a) Find a 98% confidence interval for the mean difference of wing lengths of birds between the northern regions and the southern regions. (Round your answers to 4 decimal places, if needed.) -2.0844 -0.9156 Your last answer was interpreted as follows: -2.0844 Your last answer was interpreted as follows: -0.9156 (b) Based on this confidence interval, is there enough evidence to support the belief? O Yes, since the interval contains 0. O No, since the interval is completely below 0. O No, since the interval contains 0. O Yes, since the interval is completely below 0