Question

In: Statistics and Probability

Suppose in a certain cohort study a researcher followed 360 college students who regularly smoked cigarettes,...

Suppose in a certain cohort study a researcher followed 360 college students who regularly smoked cigarettes, and 1200 college students who did not regularly smoke cigarettes. None of the subjects had peptic ulcers at the start of the study period. At the end of the study period, 90 of the smokers and 60 of the nonsmokers had at least one peptic ulcer. For simplicity, assume that none of the students died or left the study early. Also, assume the sample is representative of the population of college students in Nevada. Finally, suppose that 20% of college students in Nevada regularly smoke cigarettes.

1. In the smokers, what percentage of the risk for developing at least one peptic ulcer is directly attributable to smoking?

2. In the population of Nevada college students, what absolute amount of risk for developing at least one peptic ulcer is directly attributable to smoking?

3. In the population of Nevada college students, what percentage decrease in the risk for developing at least one peptic ulcer could be achieved by completely eliminating smoking?

Solutions

Expert Solution

In the study of peptic ulcers due to smoking in students, the provided information is,

Regular Smoker students are 360 in which 90 students have peptic ulcer

Non-smoker regularly students are 1200 in which 60 students have peptic ulcer

1) Regular Smoker students are 360 in which 90 students have peptic ulcer

I.e. 90/360 = 0.25

I.e. 25 % of the risk for developing at least one peptic ulcer is direct to the smoker.

2) 20 % students from Nevada college are the smoker.

i.e in the sample of 100 students, 20 students are the smokers.

then chances of the risk for developing at least one peptic ulcer is directly are,

= 20 * (25/100)

= 5

I.e from Nevada college 5% students have chances of the risk for developing at least one peptic ulcer

3) In Nevada college 20% student Smoker have 5% chances of the risk for developing at least one peptic ulcer is directly

I.e 95% students are safe from Nevada college (100-5)%

>>>>>>>>>>>>>>>>>>> Best Luck >>>>>>>>>>>>>>>


Related Solutions

Suppose in a certain cohort study a researcher followed 360 college students who regularly smoked cigarettes,...
Suppose in a certain cohort study a researcher followed 360 college students who regularly smoked cigarettes, and 1200 college students who did not regularly smoke cigarettes. None of the subjects had peptic ulcers at the start of the study period. At the end of the study period, 90 of the smokers and 60 of the nonsmokers had at least one peptic ulcer. For simplicity, assume that none of the students died or left the study early. Also, assume the sample...
A researcher with the Department of Education followed a cohort of students who graduated from high...
A researcher with the Department of Education followed a cohort of students who graduated from high school in a certain​ year, monitoring the progress the students made toward completing a​ bachelor's degree. One aspect of his research was to determine whether students who first attended community college took longer to attain a​ bachelor's degree than those who immediately attended and remained at a​ 4-year institution. The data in the table attached below summarize the results of his study. Complete parts​...
A researcher with the Department of Education followed a cohort of students who graduated from high...
A researcher with the Department of Education followed a cohort of students who graduated from high school in a certain​ year, monitoring the progress the students made toward completing a​ bachelor's degree. One aspect of his research was to determine whether students who first attended community college took longer to attain a​ bachelor's degree than those who immediately attended and remained at a​ 4-year institution. The data in the table attached below summarize the results of his study. Complete parts​...
A researcher with the Department of Education followed a cohort of students who graduated from high...
A researcher with the Department of Education followed a cohort of students who graduated from high school in a certain​ year, monitoring the progress the students made toward completing a​ bachelor's degree. One aspect of his research was to determine whether students who first attended community college took longer to attain a​ bachelor's degree than those who immediately attended and remained at a​ 4-year institution. The data in the table attached below summarize the results of his study. Complete parts​...
A researcher followed a cohort for 10 years after the Aliso canyon gas spill. The researcher...
A researcher followed a cohort for 10 years after the Aliso canyon gas spill. The researcher interviewed 290 residents. 140 residents lived within a 2 mile radius of the leak and were classified as exposed and 150 residents lived more than 5 miles away and were considered unexposed. In total 120 of the 140 residents exposed to the gas developed respiratory problems and 10 of the 150 not exposed to the gas developed respiratory problems. Respiratory Problems No Respiratory Problems...
1)A researcher believes that there is a correlation between the number of cigarettes smoked per day...
1)A researcher believes that there is a correlation between the number of cigarettes smoked per day and intelligence.  The following data were collected on 15 smokers.  Find Pearson's r. Number of cigarettes (X) IQ score (Y) 7    10 49 6 41    15 38   5 37 12 19    4 35 19 40   11 1 3 10 3 18 22 21 17 15 12 7    9 38    13 n=15 Sum of X= 376          Sum of Y=161   Sum...
Suppose you are a researcher studying the study habits of college students. The parameter you wish...
Suppose you are a researcher studying the study habits of college students. The parameter you wish to measure is the number of minutes students study each week. From previous research you know that this parameter is distributed Normally and has a standard deviation of 50 minutes. (Please only answer one part at a time to give other students a chance to answer as well! Start with the first one!) 1. If you wish to construct a 90% confidence interval that...
Suppose that a researcher observed the aggressive behavior of 100 college students.
  Suppose that a researcher observed the aggressive behavior of 100 college students. She ends up with a distribution of 100 scores that have a mean of 20 and a standard deviation of 8. Specify what will happened to the mean and standard deviation in each of the following cases.   a. What is the new mean if 8 is added to each score? (1 points)     b. What is the standard deviation if 8 is added to each...
College students Suppose a recent study of 1,000 college students in the U.S. found that 8%...
College students Suppose a recent study of 1,000 college students in the U.S. found that 8% of them do not use Facebook. Which of the following describes the population for this example? -All College students in the US -The 1000 college students who participated in the study -all college students in the US who do not use facebook -The 8% of college students who do not use facebook Which of the following defines what is meant by a control group...
Suppose we are interested in knowing the effect of average number of cigarettes smoked by women...
Suppose we are interested in knowing the effect of average number of cigarettes smoked by women during pregnancy on infant birth weight ( in ounces). Suppose OLS regression estimates for the intercept and the slope coefficient are given as 119.77 and -.514 respectively. Interpret  and
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT