chapter
21 Pages

ANSWERS TO EXERCISES

Differences probably not significant. The last set is more precise but the standard deviations are virtually identical (the variability is probably not different in the two

64 110 8. (a) Median 16 as in Problem 7; range 100 to 64 164

(b) Mean 8.5, S 40.09, S2 1607 10. Probably not unbiased 11. 2/3 0.816, S¯ 0.6285 13. (X x¯)2/(N 1) (0.0001 0 0.0001)/2 0.01. The s.d. of 2.19;

2.20, and 2.21 is also 0.01. If a constant is added to each value (the constant added here is 1), the s.d. is unchanged. Standard deviation depends on differences among the values, not the absolute magnitude.