Regarding only your groups data, we expect approximately 68% of your measurements to fall within one standard deviation of your mean. This means 68% of your measured values should be between the values of [% and + [% . What percentage of your measured values actually fall in this range? Does your

percentage agree well with the 68% figure we expect? 2) Approximately 95% of your measurements to fall within two standard deviations of your mean. This means 95% of your measured values should be between the values of 2[%

and + 2[% . What percentage of your measured values actually fall in this range? Does your percentage agree well with the 95% figure we expect? 3) How does SEclass compare to SEgroup? Are the two values within 1% of each other? 10%? Quantify your comparsion. 4) For each type of ball, are your predicted times in good agreement with the theoretical value? Said another way, does the theoretical result fall within the 2SE confidence interval? Said yet another way, is

2]^ < %V < + 2]^

for each type of ball?

	1 sheet)	SD 1 sheet)	Average 4 sheet)	SD 4 sheet)
1	0.8372	0.09199823735	0.8154666667	0.1129014559
2	0.63667	0.09034	0.607	0.078011
3	0.6955	0.0692441	0.62	0.0774812
4	0.6596	0.0647	0.6161	0.0641
5	0.628	0.07355013	0.647	0.082819243
6	0.6125	0.08313	0.561667	0.08685