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A political strategist claims that 58% of voters in Madison County support his candidate. In a poll of 500 randomly selected voters, 260 of them support the strategist's candidate. At alpha = .05, is the political strategist's claim warranted?
A researcher for a cereal company wanted to demon-strate the health benefits of eating oatmeal. A sampleof 9 volunteers was obtained and each participant ate afixed diet without any oatmeal for 30 days. At the endof the 30-day period, cholesterol was measured foreach individual. Then the participants began a second30-day period in which they repeated exactly the samediet except that they added 2 cups of oatmeal eachday. After the second 30-day period, cholesterol levelswere measured again and the researcher recorded thedifference between the two scores for each participant.For this sample, cholesterol scores averaged MD=16points lower with the oatmeal diet with SS=538 forthe difference scores. Are the data sufficient to indicate a significant change in cholesterol level? Use a two-tailed test with a= .01. Compute r2,the percentage of variance accounted for by the treatment, to measure the size of the treatment effect. Write a sentence describing the outcome of the hypothesis test and…
A medical researcher says that 25% of U.S. adults are smokers. In a random sample of 272 US, adults, 57 say that they are smokers at a- 0.05, is there enough evidence to support that less than 25% of U.S. adults are smokers? What shall we use for Ho and Hy? Hg p-0.25 Hp 025 Ho p> 025 Hi:p<025
A survey was conducted among 50 PUP students to know the brand of vaccine they had for the first 2 doses and their booster. The responses were tallied and revealed that 20 students had both Sinovac and Astrazenica while 17 has Astrazenica only and 10 had Sinovac only. How many from these students were vaccinated with Sinovac or Astrazenica?
The probability that a person in the United States has type B+ blood is 8%. Five unrelated people in the United States are selected at random. Complete parts (a) through (d). (a) Find the probability that all five have type B+ blood. The probability that all five have type B+ blood is nothing. (Round to six decimal places as needed.) (b) Find the probability that none of the five have type B+ blood. The probability that none of the five have type B+ blood is nothing. (Round to three decimal places as needed.) (c) Find the probability that at least one of the five has type B+ blood. The probability that at least one of the five has type B+ blood is nothing. (Round to three decimal places as needed.) (d) Which of the events can be considered unusual? Explain. Select all that apply. A. The event in part (a) is unusual because its probability is less than or equal to 0.05. B. The event in part (b) is unusual because its probability is…
A production superintendent claims that there is no difference between the employee accident rates for the day versus the evening shifts in a large manufacturing plant. The number of accidents per day is recorded for both the day and evening shifts for n = 100 days. It is found that the number of accidents per day for the evening shift XE exceeded the corresponding number of accidents on the day shift xp on 63 of the 100 days. Do these results provide sufficient evidence to indicate that more accidents tend to occur on one shift than on the other or, equivalently, that P(XE > XD) # 1/2?
A national study found that treating people appropriately forhigh blood pressure reduced their overall mortality by 20%. Treating people adequately for hypertension has been dif-ficult because it is estimated that 50% of hypertensives do not know they have high blood pressure, 50% of those who do know are inadequately treated by their physicians, and 50% who are appropriately treated fail to follow this treat-ment by taking the right number of pills. a-What is the probability that among 10 true hyperten-sives at least 50% are being treated appropriately and are complying with this treatment? b- What is the probability that at least 7 of the 10 hyper-tensives know they have high blood pressure? c- If the preceding 50% rates were each reduced to40% by a massive education program, then what effectwould this change have on the overall mortality rate amongtrue hypertensives; that is, would the mortality rate decreaseand, if so, what percentage of deaths among hypertensivescould be prevented…
A sample of 323 urban adult residents of a particular state revealed 65 who favored increasing the highway speed limit from 55 to 65 mph, whereas a sample of 177 rural residents yielded 75 who favored the increase. Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? (a) Test H0: p1 − p2 = 0 versus Ha: p1 − p2 ≠ 0 using ? = 0.05, where p1 refers to the urban population. (Round your test statistic to two decimal places and your P-value to four decimal places.) z = P-value = State the conclusion in the problem context. Fail to reject H0. The data suggests that the sentiment for increasing the speed limit is different for the two groups of residents.Reject H0. The data suggests that the sentiment for increasing the speed limit is different for the two groups of residents. Fail to reject H0. The data does not suggest that the sentiment for increasing the speed limit is different for the two groups of…
Assume that random guesses are made for 3 multiple-choice questions on a test with 2 choices for each question, so that there are n=3 trials, each with probability of success (correct) given by p=0.50. Find the probability of no correct answers.
Of 9 randomly selected male students, Xj used Apple computer, whereas of 12 randomly selected female student, X2 used Apple computer. Let: p1 and p2 denote the probabilities that a randomly selected male and female students, respectively, played tennis. what is unbiased estimator of P1 - P2 ? X2 Da. 7+ 12 X1 X2 Ob. 49 144 X2 12 X1 Od. 49 X2 144
proe loolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). QUESTION 7 On a random cross medical checkup in Muscat airport. the statistic shows 45% of the travelers are form region A, 35% are form region B, and 20% are form region C. The Medicine doctors have found that 6% of the travelers form r 7% of the travelers form region yhelshe region A? TTTT Paragraph v Arial v 3(12p E- E- T-