In a cohort study of 300 members of the Men of Leisure Club who took a vacation to the Bahamas, 170 became infected with giardiasis. One hundred twenty nine (129) who swam in a resort pool became ill, and 94 who did not swim did not become ill. Set up the 2x2 table and calculate the appropriate rate of risk.
Q: How many females and males of the sample have satisfying non- academic performance inspite of having…
A: Given information: Total population of first-year optometry students from DDC = 65 20% of the sample…
Q: Brink studied the effect of postural change on cardiovascular reactivity for a sample of healthy…
A:
Q: In a survey of 10,000 IV drug abusers in town A, 1,000 turn out to be infected with hepatitis C and…
A:
Q: A random sample of 113 felons convicted of nonviolent crimes in a state prison system completed a…
A: Given , n= 113 , x = 58 Here One prop Z test is applicable
Q: An independent research group is interested in showing that the percentage of babies delivered…
A:
Q: Research done at the Harvard School of Public Health showed that regular soda drinkers may have a…
A: (1)A dependent or response variable is measured while conducting an experiment. Its value depends on…
Q: It was reported that some sixty-seven percent of Covid 19 infection, over one summer month in a…
A: Given information: 67% of Covid 19 infection, over one summer month in a European country, were…
Q: A researcher tests reaction time of each group of 14 individuals twice once while in a very hot room…
A: t-test for independent means: When two groups of people who are not dependent on each other are…
Q: A recent random sample of 7 college graduates who found a job reported their GPA and entry level…
A:
Q: Fifty patients with high lipoprotein and thirty patients with low lipoprotein were observed. None of…
A: Introduction: It is required to calculate the relative risk of developing ischemic stroke in eight…
Q: In a study conducted to examine criminal behavior in society, 800 questionnaires were conducted. 6%…
A:
Q: In the largest clinical trial ever conducted, 401,974 children were randomly assigned to two…
A: Given Information : In the largest clinical trial ever conducted, 401,974 children were randomly…
Q: In the largest clinical trial ever conducted, 401 ,974 children were randomly assigned to two…
A: Given - No. of children given Salk vaccine for polio, n1 = 201229 No. of children given a placebo,…
Q: The survival curve below was constructed from a study that followed 7 individuals being treated with…
A: 1] The total number of individuals studied were n=7 2] The total duration of the study is 8 months.…
Q: A hospital reported that the nomal death rate for patients with etensive burns (more than 40% of…
A:
Q: In the largest clinical trial ever conducted, 401,974 children were randomly assigned to two groups.…
A:
Q: A study is conducted to test a new drug claimed to reduce diastolic blood pressure in adults with a…
A: It is given that a study is conducted to test a new drug and it is interested that whether the drug…
Q: A researcher conducts an experiment comparing four treatment conditions with n = 12 scores in each…
A: (1) Determine the number of individuals are needed for the independent measures design. The number…
Q: Surgery was performed on 492 patients in the Anywhere Health Care Facility during March, and 27 of…
A: Given information: Total number of patients who received a surgery is 492. Total number of death…
Q: According to the Centers of Disease Control, about 20% of American young people between the ages of…
A: Given that According to the centers of disease control About 20% of American young people between…
Q: In the general population, Democrats are estimated to have an average mental health index score of…
A: The summary statistics of mental health index for the general population is mentioned in the table.…
Q: Regardless of age, about 20% of American adults participate in fitness activities at least twice a…
A: Solution: Let X be number of people indicated that they participated in a fitness activity at least…
Q: Of 10000 randomly selected cases of lung cancer, 823 resulted in death within 10 years. Does this…
A: Given claim: The death rate from cancer is 8%. Null Hypothesis: H0: The death rate from cancer is…
Q: Data released by the Department of Education regarding the rate (percentage) of ninth-grade students…
A: Given that, the total number of states are 50. That is, nU=50. Let A represents the set of all…
Q: A researcher is trying to determine whether exposure to solvents is associated with the risk of…
A: The relative risk associated with an event can be given by the ratio of probability of happening of…
Q: An employee survey conducted two years ago by a company found that 46% of its employees were…
A: v
Q: In the largest clinical trial ever conducted, 401,974 children were randomly assigned to two…
A: The samples have to be simple random samples that are independent, which is satisfied because the…
Q: A researcher reports an F-statistic (F-ratio) with df = (3, 18) from an independent-measures ANOVA.…
A: Based on df values Treatment df = 3 Error df = 18 Therefore, Total degrees of freedome = Treatment…
Q: Historically, the proportion of people who trade in their old car to a car dealer when purchasing a…
A: Solution: Given information: n= 115 Sample size x= 46 success p^=xn=46115=0.40 sample proportion…
Q: researcher decides to follow a group of 8 individuals taking a specific anti-TNF drug used to treat…
A: Based on the given chart, First individual developed the immunity in 6 months Second individual…
Q: A 2017 survey of over 5,000 college graduates found that the average graduated from a four-year…
A: It is given that the educational debt follows a normal distribution with mean $28,650 and standard…
Q: In the past decade, intensive anti-smoking campaigns have been sponsored by both federal and private…
A:
Q: A team of researchers believe that millennials engage more in positive social media than baby…
A: We have, N = 198+212 = 410 The test hypothesis are, H0: The proportion of millennial's engaging in…
Q: Do Left-Handers Die Earlier? According to a study published in the Journal of the American Public…
A: Observational study: The investigators may simply observe a predefined set of individuals and…
Q: A researcher is interested in the effect of the pandemic on social media use among college students.…
A: 1) The researcher wants to test the effect of the pandemic on social media use by college students.…
Q: A sociologist sampled 200 people who work in computer-related jobs, and found that 42 of them have…
A:
Q: According to the National Health and Nutrition Examination Survey (NHANES) sponsored by the U.S.…
A: Given: xy = 83.4, sy = 18, ny = 712xs = 78.5, ss = 19, ns = 1001 A random sample of 712 males having…
Q: In a sample of 88 children selected from a city, 8 children suffer from asthma. What is the P-value…
A: Statistical hypothesis testing is an important method in inferential statistics. Statistical tests…
Q: An organization published an article stating that in any one-year period, approximately 11.5 percent…
A:
Q: In a random sample of 1022 U.S. adults, 480 think that the U.S. government is doing too little to…
A: Hypotheses: Here p1 and p2 be the two proportions. The aim is to check whether p1= p2. The null…
Q: What is the worst case survival rate after 24 months assuming all patients censored ended up dying?…
A: Solution: The worst case survival rate after 24 months: From the graph it can be shown that the…
Q: A sample obtained from a population with σ = 12 has a standard error of σx̅ = 2 points. How many…
A: We have given that, The population standard deviation (sigma) = 12 And standard error (sigmax) = 2…
Q: A study of 200 randomly selected occupants in passenger cars and 250 randomly selected occupants in…
A: Here, p1 represents the proportion of occupants in passenger cars and p2 represents the proportion…
Q: In the largest clinical trial ever conducted, 401,974 children were randomly assigned to two groups.…
A: From the given information, Let n1 = 201229 represent the number of children given the Salk vaccine…
Q: In an area where there is no radioactive fallout, 1% of newborns show genetic disorders. Genetic…
A: Given: Sample size (n) = 10000 Number of success (x) = 150 Hypothesized proportion (p) = 0.01 α=0.05
Q: In one study, researchers at McGill University recruited127 people with high cholesterol and split…
A: Completely randomized design It refers to an experimental design, where all experimental units have…
Q: In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from…
A: Given information- Sample size, n = 88 It is found that 8 of them suffer from asthma. So, x = 8 So…
Q: Consider an outbreak of shigellosis in which 18 persons in 18 different households all became ill.…
A: Number of people in the community is 100 Number of people became ill is 18
Q: In a recent year, some professional baseball player complained that umpires were calling more…
A: Given x=2231 n=3581
In a cohort study of 300 members of the Men of Leisure Club who took a vacation to
the Bahamas, 170 became infected with giardiasis. One hundred twenty nine (129)
who swam in a resort pool became ill, and 94 who did not swim did not become ill. Set
up the 2x2 table and calculate the appropriate rate of risk.
Given,
Among 300 members of men , 170 became infected with giardiasis. One hundred twenty nine (129)
who swam in a resort pool became ill, and 94 who did not swim did not become ill
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- From a random sample of 1000 Americans, it was discovered that 920 of them lived in neighborhoods with acceptable levels of Carbon Monoxide. (Source: The Environmental Protection Agency) Obtain a point estimate for the proportion of Americas who live in neighborhoods with acceptable levels of carbon monoxide.A survey of 90 recently delivered women on the rolls of a county welfare department revealed that 27 had a history of intrapartum or postpartum infection. What is the critical value of z if we need to conclude that the population proportion with a history of intrapartum or postpartum infection is less than 0.25.Do Left-Handers Die Earlier? According to a study published in the Journal of the American Public Health Association, lefthanded people do not die at an earlier age than right-handed people, contrary to the conclusion of a highly publicized report done 2 years earlier. The investigation involved a 6-year study of 3800 people in East Boston older than age 65. Researchers at Harvard University and the National Institute of Aging found that the “lefties” and “righties” died at exactly the same rate. “There was no difference, period,” said Dr. J. Guralnik, an epidemiologist at the institute and one of the coauthors of the report.
- A study of 420,002 to cell phone users found that 133 of them develop cancer of the brain and nervous system part of the study of cell phone use the rate of such cancer was found to be .0239% for those not using cell phones. Complete parts (A) and (B).In the nation of Gondor, the EPA requires that half the new cars sold will meet a certain particulate emission standard a year later. A sample of 64 one-year-old cars revealed that only 20 met the particulate emission standard. What is the test statistic to see whether the proportion is below the requirement?Assume that last year in a particular state with 700000 children there were 1471 children out of 32500 in a random sample who were diagnosed with Autism Spectrum Disorder. Nationally, 1 out of 88 children are diagnosed with ASD. Is there sufficient data to show that the incident rate of ASD is higher in that state than nationally? Test at the 1% level.
- Brink studied the effect of postural change on cardiovascular reactivity for a sample of healthy white and African American men and women. Change in systolic blood pressure (SBP) from supine to standing position was used as the measure of cardiac reactivity in a sample of 842 adults. Supine measurement of blood pressure was taken after participants had lain on an examination table for 15 minutes. Blood pressure was measured five times every 2 minutes using a preset automated blood pressure monitor, and the five measurements were averaged. Participants then stood up, and an additional five measurements were made over another 10-minute period and then averaged. Below is a table describing the characteristics of Brink’s sample. Characteristics of the Study Sample (N = 842) Sample Characteristic Frequency (N) Percentage or Mean (SD) Range Gender Female Male 408 434 48.5% 51.5% Age (years) 842 55.1 (5.3) 44–67 Race/ethnicity White, not Hispanic…For the past years, 20% of the babies were delivered through cesarean section. The research group randomly inspects the medical records of 144 births and finds that 25 of births were by cesarean section. Can the researcher group conclude that the percent of births by cesarean section has decreased at 5% level of significance?A 2017 survey of over 5,000 college graduates found that the average graduated from a four-year college or university had an average student loan debt of $28,650 (s.d. = $3,280). Assuming that educational debt is normally distributed, calculate the percentile rank of a recent graduate who graduated with $35,636 in education-related debt.
- The survival curve below was constructed from a study that followed 7 individuals being treated with prednisone for inflammatory conditions over a period of 8 months. Assuming the event described is the point in time the individuals developed prednisone-induced hypertension and those individuals who made it to 8 months concluded the study without prednisone-induced hypertension, calculate and interpret the proportion of individuals who suffered from prednisone-induced hypertension at the end of the study. A) 14.3% of individuals in the study did not develop prednisone-induced hypertension. B) 14.3% of individuals in the study did not develop prednisone-induced hypertension during the time frame in which the study was being conducted. C) 85.7% of individuals in the study did not develop prednisone-induced hypertension. D) 85.7% of individuals in the study did not develop prednisone-induced hypertension during the time frame in which the study was being conducted.A study of 200 randomly selected occupants in passenger cars and 250 randomly selected occupants in pickup trucks show that 182 of occupants in passenger cars and 208 of occupants in pickup trucks wear seat belts. At α=0.10, can you reject the claim that the proportion of occupants who wear seatbelts is the same for the passenger cars and pickup trucks?