9. Which ONE of these sampling methods is a probability method? a) Quota sample. b) Judgement sample. c) Convenience sample. d) Simple random sample.

The contingency table shows how many people wore (Y) and did not wear (N) seat belts as well as how many survived (S) and died (D) in car accidents in a recent year. Wore seat belt Survived (S) D 370,313 Yes (Y) No (N) 175,079 Total 545,392 Complete parts a through d below. S a. What is the sample space for a randomly selected individual involved in an auto accident? Use a tree diagram to illustrate the possible outcomes. OA. O C. D S D D Died (D) 766 1314 2080 Sample space: {SS, SD, DS, DD} B. Y S D S D Sample space: {YS, YD, NS, ND} b. Using the data in the table, estimate (i) P(D), (ii) P(N). (i) P(D) 0.0038 (Round to four decimal places as needed.) Total 371,079 176,393 547,472 (ii) P(N) 0.3222 (Round to four decimal places as needed.) c. Estimate the probability that an individual did not wear a seat belt and died. P(N and D) (Round to four decimal places as needed.) Y N S S D D Sample space: {YS, YS, ND, ND} OD. N N Y N Sample space: {YY, YN, NY,NN}

8. The local florist serves 24 schools. The owner wants to interview a sample of 4 principals in detail to find ways to improve services to his/her clients. To avoid bias, the owner chooses a simple random sample size 4. Briefly explain how you could choose a simple random sample. Give an example.

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