ANSWERS FOR UNIT 5 CUMULATIVE REVIEWS

ANSWERS FOR UNIT 5 CUMULATIVE REVIEWS

Statistical Reasoning Final Exam Review 1 Focus: Unit 5 ANSWERS

Multiple Choice: (1) E (2) D (3) E (4) C (5) C (6) A (7) E (8) D (9) C. (10) B (11) E (12) E (13) A (14) D (15) B (16) No. For instance, if exercise or meditation is the explanatory variable, participants will know they are in the treatment group. (17) randomization, control and replication (18) amount of water or sunlight plants receive or soil fertility.

ANSWERS FOR UNIT 6 CUMULATIVE REVIEWS

Statistical Reasoning Cumulative Review 3 Focus: Unit 6 ANSWERS (1) P(A) + P(B) (2) P(A) + P(B) ? P(A B) (3) P(A) P(B) (4) P(A)P(BA) (5) 8/15 = 0.533 (6) a. 0 b. 1 c. 0.41 (7) a. (see below) b.17/20 = 0.85 c.1/4 = 0.25 d. 3/10 = 0.3 (8) (7/15)(6/14)(5/13)=(1/13 = 0.0769 (9) (0.5)4 + (0.5)4 = 0.125 (10) (1/12)(1/7)=1/84 = 0.0119 (11) a. (0.6)6 = 0.0467 b. (0.4)6 = 0.00410 (12) a. 1/16 = 0.0625 b. (1/4)(2/11) = 1/22 = 0.0455 (13) 0.62/0.85 = 0.729 (14) P(M S) = 0.85 + 0.72 ? 0.62 = 0.95 (15) (35/60)(34/59) = 0.336

7. a.

Dem Rep

16. a. M

Women 35 15 50

R8

Men 25 25 50

RC 4

60 40 100

12

MC

16. b.

M R

3 11

4 83

5 9 8 20

1 23 4 5

16. c. M

MC

R P(M andR) = 0.4 RC P(M and RC ) = 0.2

R P(MC and R) = 0.15 RC P(MC and RC ) = 0.25

Statistical Reasoning Cumulative Review 4 Focus: Unit 6 ANSWERS (1) a. not mutually exclusive b. not mutually exclusive (2) a. No b. Yes c. 0.564 (3) AC is getting at least one question wrong (4) a. 0.3 b. 0.4 c. (6/10)(5/9) = 1/3 = 0.333 (5) a. 115/240 = 0.479 b. 171/240 = 0.713 c. 160/240 = 0.667 d. 35/240 = 0.146 e. 46/88 = 0.523 f. 45/125 = 0.36 (7) a. 1- P(all are incorrect) = 1 ? (0.5)8 = 0.996 b. (0.5)8 + (0.5)8 = 0.00781 (8) (0.5)(0.5)(0.25) = 0.0625 (9) (9/12)(3/11) + (3/12)(9/11) = 0.409 or ( 9 C1g3C1) / C 12 2 (10) a. (3/7)3 = 27/343 = 0.0262 b. (3/7)(2/6)(1/5) = 1/35 = 0.0286 (11) a. see below b. 9/14 = 0.643 c. 0.625 d. below e. These are the students who are neither female nor majoring in sociology (12) 0.5 (13) 0.0475/(0.0475 + 0.19) = 0.2 (14) 0.001/(0.001 + 0.0198) = 0.0481

11 a. M F 11. d.

13.

H Psy 5 3 8

Soc 1 5 8

3 51

6 8 14

5

HC

P P(H and P) = 0.0475 PC P(H andPC ) = 0.0025 P P(HC and P) = 0.19 PC P(HC and PC ) = 0.76

14. A

AC

D P(A and D) = 0.001 DC P(A and DC ) = 0.009 D P(AC and D) = 0.0198 DC P(AC and DC ) = 0.9702

ANSWERS FOR UNIT 7 CUMULATIVE REVIEWS

Statistical Reasoning Cumulative Review 5 Focus: Unit 7 ANSWERS (1) sample proportion, population proportion, p, p^ (2) , s (3) a. 0.480 b. all teenagers in Texas who drive c. (0.4725, 0.4875) d. (0.4712, 0.4889) e. (0.4682, 0.4918) ee. We are 90% confidence that the true percentage of teenagers who use cell phones while driving is contained in the interval (47.25%, 48.75%). (4) We got this interval by using a method that catches the true unknown population proportion in 90% of all samples (5) a. 7,214 b. (0.783, 0.797)

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