During a recent study of 2100 participants, it was found that 754 had indications of hypertension....
During a recent study of 2100 participants, it was found that 754 had indications of hypertension. Estimate the true proportion of those in the population with indications of hypertension with 99% confidence.
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During a recent study of 2100 participants, it was found that
754 had indications of hypertension....
A recent study of 28 city residents showed that the mean of the time they had...
A recent study of 28 city residents showed that the mean of the time they had lived at their present address was 9.3 years and the standard deviation was 2 years. Assuming a normal population, find the 90% confidence interval of the true mean. Interpret the interval estimate. A US Travel Data Center survey conducted for Better Homes and Gardens of 1500 adults found that 39% said that they would take more vacations this year than last year. Find the...
There are many reasons adults use credit cards. A recent survey found that 75% of adults...
There are many reasons adults use credit cards. A recent survey found that 75% of adults used credit cards for convenience. a. To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within t0.03 of the population proportion, how many people need to be sampled? b. To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within t0.06 of the population proportion, how many people need...
A study found that of 3,532 randomly selected Americans with hypertension, only 1,219 were receiving treatment...
A study found that of 3,532 randomly selected Americans with hypertension, only 1,219 were receiving treatment for it. A. What is the sample statistic (p̂ or ȳ)? Please calculate/write its value. B. Construct a 90% confidence interval for the true proportion of all Americans who are having their hypertension treated. Provide the interval in (left endpoint, right endpoint) format. C. Interpret the confidence interval in the context of the study.
A recent study of 3000 children randomly selected found 23% of them deficient in vitamin D....
A recent study of 3000 children randomly selected found 23% of them deficient in vitamin D. a) Construct the 98% confidence interval for the true proportion of children who are deficient in vitamin D. left parenthesis nothing comma nothing right parenthesis (Round to three decimal places as needed.) b) Explain carefully what the interval means. A. We are 98% confident that the interval contains the true proportion of children deficient in vitamin D. B. We are 98% confident that the...
According to a study, 77% of adults ages 18-29 years had broadband Internet access at home...
According to a study, 77% of adults ages 18-29 years had broadband Internet access at home in 2011. A researcher wanted to estimate the proportion of undergraduate college students (18-23 years) with access, so she randomly sampled 186 undergraduates and found that 166 had access. Estimate the true proportion with 99% confidence. Round your answers to three decimal places. Source: World Almanac 2012. Sp
In a study of crime, the FBI found that 13.2% of all Americans had been victims...
In a study of crime, the FBI found that 13.2% of all Americans had been victims of crime during a 1-year period. This result was based on a sample of 1,105. Estimate the upper limit of the confidence interval of the percentage of U.S. adults who were victims at the 99% confidence level. Please round to the nearest whole number.
In a cohort study exploring the relationship between acute myocardial infarction and hypertension, the study investigators...
In a cohort study exploring the relationship between acute myocardial infarction and hypertension, the study investigators enrolled 10,000 people with hypertension and 10,000 people without hypertension. All study participants were healthy and had no previous history of myocardial infarction. The investigators followed the subjects until the subject developed a MI or 15 years elapsed, whichever came first. 180 of the subjects with hypertension and 30 subjects without hypertension developed Ml during the course of the study. If no Ml developed...
In a cohort study exploring the relationship between acute myocardial infarction and hypertension, the study investigators...
In a cohort study exploring the relationship between acute myocardial infarction and hypertension, the study investigators enrolled 10,000 people with hypertension and 10,000 people without hypertension. All study participants were healthy and had no previous history of myocardial infarction. The investigators followed the subjects until the subject developed a MI or 15 years elapsed, whichever came first. 180 of the subjects with hypertension and 30 subjects without hypertension developed MI during the course of the study. If no MI developed...
Construct a 95% confidence interval to estimate the population proportions 3. In a recent poll of...
Construct a 95% confidence interval to estimate the population
proportions
3. In a recent poll of 200 household, it was found the 1 52 households had at least one computer. Estimate the proportion of household in the population that has at least one computer. Construct a 95% confidence interval to estimate the population proportions.
A study investigating rates of fatalities among patients with serious traumatic injuries found that out of...
A study investigating rates of fatalities among patients with serious traumatic injuries found that out of 150 patients transported by helicopter, 19 died. For ground transportation (ambulance) 44 out of 400 died. Provide a 99% confidence interval estimate for the true difference in proportion of death between air and ground transportation. Referring back to your hypothesis test and confidence interval, explain how they lead to similar conclusions.
There are many reasons adults use credit cards. A recent survey found that 75% of adults used credit cards for convenience. a. To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within t0.03 of the population proportion, how many people need to be sampled? b. To conduct a follow-up study that would provide 99% confidence that the point estimate is correct to within t0.06 of the population proportion, how many people need...
According to a study, 77% of adults ages 18-29 years had broadband Internet access at home in 2011. A researcher wanted to estimate the proportion of undergraduate college students (18-23 years) with access, so she randomly sampled 186 undergraduates and found that 166 had access. Estimate the true proportion with 99% confidence. Round your answers to three decimal places. Source: World Almanac 2012. Sp
In a cohort study exploring the relationship between acute myocardial infarction and hypertension, the study investigators enrolled 10,000 people with hypertension and 10,000 people without hypertension. All study participants were healthy and had no previous history of myocardial infarction. The investigators followed the subjects until the subject developed a MI or 15 years elapsed, whichever came first. 180 of the subjects with hypertension and 30 subjects without hypertension developed Ml during the course of the study. If no Ml developed...
In a cohort study exploring the relationship between acute myocardial infarction and hypertension, the study investigators enrolled 10,000 people with hypertension and 10,000 people without hypertension. All study participants were healthy and had no previous history of myocardial infarction. The investigators followed the subjects until the subject developed a MI or 15 years elapsed, whichever came first. 180 of the subjects with hypertension and 30 subjects without hypertension developed MI during the course of the study. If no MI developed...
Construct a 95% confidence interval to estimate the population
proportions
3. In a recent poll of 200 household, it was found the 1 52 households had at least one computer. Estimate the proportion of household in the population that has at least one computer. Construct a 95% confidence interval to estimate the population proportions.
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