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Biostatistics

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ANSWERS TO ODD-NUMBERED EXERCISES A-117<br />

7. (a) 1. .2200 2. .5000 3. .0555 4. .1100 5. .5900<br />

(b) 1. .3000 2. .3900 3. .3900 4. .1667 5. .0700 6. .6000<br />

9. (a) .0432 (b) .0256 (c) .0247 (d) .9639 (e) .5713<br />

(f) .9639 (g) .9810<br />

11. .0060<br />

13. .0625<br />

15. mothers under the age of 24<br />

17. null set, as events are mutually exclusive<br />

19. (a) plasma lipoprotein between 10–15 or greater than or equal to 30.<br />

(b) plasma lipoprotein between 10–15 and greater than or equal to 30.<br />

(c) plasma lipoprotein between 10–15 and less than or equal to 20.<br />

(d) plasma lipoprotein between 10–15 or less than or equal to 20.<br />

21. (a) .7456 (b) .3300<br />

23. .0125<br />

Chapter 4<br />

4.2.1. (a)<br />

Number of<br />

Substances Used<br />

Frequency<br />

Relative<br />

Frequency<br />

Cumulative<br />

Frequency<br />

0 144 .19 .19<br />

1 342 .44 .63<br />

2 142 .18 .81<br />

3 72 .09 .90<br />

4 39 .05 .95<br />

5 20 .03 .98<br />

6 6 .01 .99<br />

7 9 .01 1.00<br />

8 2 .003 1.003<br />

9 1 .001 1.004<br />

Total 777 1.004<br />

(b) 0.5<br />

0.4<br />

Frequency<br />

0.3<br />

0.2<br />

0.1<br />

0.0<br />

0 1 2 3 4 5 6 7 8 9<br />

Number of Substances Used

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