5. Psychologists have been investigating the differences between people with at least one brother or sister and those wi

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5 Psychologists Have Been Investigating The Differences Between People With At Least One Brother Or Sister And Those Wi 1 (178.13 KiB) Viewed 67 times

5. Psychologists have been investigating the differences between people with at least one brother or sister and those with none. In a letter to the New England Jounal of Medicine, researchers announced the results of a survey of 472 adults in Buffalo, New York. The experiment recorded whether the respondent suffered from hypertension and whether she or he had siblings. The data were summarized as shown bellow, SIBLING 79 262 NO SIBLING 39 92 TOTAL 118 354 Suffer from hypertention Do not suffer from hypertension TOTAL 131 472 341 REQUIRED Do these data allow us to conclude at the 5% significance level that adults with no siblings suffer different rates of hypertension than those with siblings? 6. A company tenders for two contracts A and B. The probability that it will obtain contract A is one-third and the probability that it will obtain contract B is one-fourth. REQUIRED Find the probability that the company; (0) Will obtain both contract (ii) Will obtain only one contract.