Figure 2: In an autism study discussed by Wheelan, two samples of kids were drawn and compared. You see the 95 % CI's for the average brain size (in cubic centimeters of volume), for each sample, the X=0 non-autistic group, and the X=1 autistic group. 95% confidence interval 95% confidence interval for the non-autism for children with general population autism spectrum disorder 1202.8 1238.8 1274.8 1284.4 1310.4 1336. 1150 1200 1250 1300 (a) What is the unit of observation here? [1 pt] (b) Looking at the Figure, how much (approximately, in the cubic centimeter volume units depicted) is the SE for the non-autism sample, and for the autism sample? [1 pt] (c) Based on the length of the interval and your knowledge of the formula for SE, which group is larger, the X=0 or X=1 groups? Why? [1 pt] (d) Will you still be able, at the same confidence level or greater confidence, to reject the Null Hypothesis of no difference in brain sizes between the groups if the number of non-autistic kids in the sample were smaller? [1 pt] (e) Will you still be able, at the same confidence level or greater confidence to reject the Null Hypothesis of no difference in brain sizes between the groups if the mean for kids with autism were greater than 1310.4 cubic centimeters? [1 pt]