In a clinical trial of 734 subjects treated with medicine A, 29 reported headaches. In a control group of 735 subjects not treated with medicine A, 117 reported headaches. The Risk Ratio is equal to: [ 0 0 0 1.142 O 0.248 O 0.373
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- A mining company finds that daily lost-work injuries average 1.2. If the local union contract has a clause requiring that the mine be shut down as soon as three workers incur lost-work injuries, on what percentage of the days will the mine be operational throughout the day?in a city a,20% of a random sample of a 900 school boys had a slight certain physical defect. in another city b,18.5% of a random sample of 1600 school boys had the same defect.is the difference between the proportions is significant?Independent surveys show that the average IQ of 9 r/s babies exposed to cocaine in the uterus is 81 with s.d. 18, while the average IQ of 20 r/s babies unexposed to cocaine in the uterus is 99 with s.d. 9. Construct a 90% c.i. for the difference between the overall average IQs of exposed and unexposed babies. Assume that both populations are normal.
- A researcher is wondering whether the smoking habits of young adults (18-25 years of age) in a certain city in the U.S. arethe same as the proportion of the general population of young adults in the U.S. A recent study stated that the proportionof young adults who reported smoking at least twice a week or more in the last month was 0.16. The researcher collecteddata from a random sample of 75 adults in the city of interest. State the hypotheses to be tested for this study. Also, identify which hypothesis is the claim. H0:_______________________ Ha:______________________Assume a significance level of a = 0.05 and use the given information to complete parts (a) and (b) below. Original claim: More than 42% of adults would erase all of their personal information online if they could. The hypothesis test results in a P-value of 0.0156. a. State a conclusion about the null hypothesis. (Reject H, or fail to reject Ho.) Choose the correct answer below. O A. Reject H, because the P-value is less than or equal to a. O B. Fail to reject H, because the P-value is greater than a. O C. Fail to reject H, because the P-value is less than or equal to a. D. Reject H, because the P-value is greater than a. b. Without using technical terms, state a final conclusion that addresses the original claim. Which of the following is the correct conclusion? O A. The percentage of adults that would erase all of their personal information online if they could is less than or equal to 42%. O B. There is not sufficient evidence to support the claim that the percentage of adults that…3. In a test of roughly 2000 men and women, those with moderately high blood pressure(averaging 164/89 mm Hg) did worse on a memory and reaction test than those with normalblood pressure.a. Describe the type of study being performed.b. From this study is there any way to know if high blood pressure caused the participants to do worse on the memory and reaction test? Explain.
- In a city A 20% of a random sample of 900 school boys had a certain slight physical defect. In another city B, 18.5% of a random sample of 1600 school boys had the same defect. Is the difference between the proportions significant ?A market researcher claims that the purchases for a particular gift item are men, 50 percent; women, 40 percent; and children under 18, 10 percent. The researcher takes a sample in a very large department store and finds in a given week that 43 items were purchased by men, 33 by women, and 4 by children under 18. Does the evidence support the claim of the market researcher? Use alpha = 0.05In a previous pollI, 37% of adults with children under the age of 18 reported that their family ate dinner together seven nights a week. Suppose that, in a more recent polI, 387 of 1109 adults with children under the age of 18 reported that their family ate dinner together seven nights a week. Is there sufficient evidence that the proportion of families with children under the age of 18 who eat dinner together seven nights a week has decreased? Use the a=0.01 significance level. Because npo (1- Po) = 10 and the sample size is V 5% of the population size, and the sample V the requirements for testing the hypothesis V satisfied. (Round to one decimal place as needed.) What ere the null and alternative hypotheses? V versus H, Type integers or decimals. Do not round.) Find the test statistic, Zo 20= (Round to two decimal places as needed) Find the P-value Pvalue = (Round to three decimal places as needed.) Is there sufficient evidence that the proportion of families with children under the…