Which research design studies only people who are initially free of the disease of interest? Explain how this study design is different from the rest of the research designs
Q: a research design where each person is tested in two different conditions is called what?
A: Between-subjects (or between-groups) study design: different people test each condition, so that…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: t-test for the difference of two sample means: Suppose we want to test whether there is a…
Q: An investigator at the CDC wants to look at the relationship between children’s pre-natal exposure…
A: The given table of 325 children can be rearranged as follows. Asthma No Asthma Total ETS…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: Consider the variance for women: x¯women=4+3+5+2+45=3.6 swomen2=∑(x-x¯women)2n-1…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: Given Information : Anterior cruciate ligament (ACL) injuries occur most frequently in planting and…
Q: Some of the parameters required for power analysis include effect size, apha level, and beta level.…
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Q: e bias impacts
A: The implementation of screening programs are useful in detecting the early stages of complex…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: If we increase sample size n=30 to n= 80 As the sample size gets larger, the z value increases…
Q: Studies have suggested that alcohol abuse and disorders are found to be more prevalent during early…
A: a) Denote p1, p2 as the true population proportions of young adults who have consumed alcohol and…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: The number of grade 3 ACL tears had in 5 seasons by males and females of 5 universities are given.
Q: What does it mean if the cases are not selected randomly but are assigned randomly to groups?
A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: A study’s ability to reveal a statistically significant difference between the levels of an…
A: The power of any test of statistical significance, it is defined as the probability, it will reject…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: Test Statistic for Difference of 2 means is given by, Z= (X1 bar -X2 bar )-(mu1-mu2))/√S12…
Q: When conducting a retrospective cohort study what are some possible selection and information bias…
A: The study is categorised into 2 Prospective cohort study Retrospective cohort study Prospective…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: A t test is to be performed and the hypotheses will be- H0:μw=μm vs H1:μw>μmThe above hypotheses…
Q: A professor from the University of Álabama is interested in determining whether or not people from…
A: A t test is used to determine to check whether there is significant difference between means of two…
Q: A snack company is switching to environmentally friendly bags for its potato chips. The company is…
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Q: A researcher is conducting a study on the palliative care of patients at a specific facility to…
A: Given: Sample size n = 9 Significance level α = 0.05 Formula Used: Test-statistic Z = W-μσ Expected…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: Given the data of men and women as Women Men 4 2 3 0 5 1 2 2 4 1
Q: Like many studies that involve BMI, the above studies are using BMI as a proxy for fat, and fat as a…
A: BMI- Body mass index, used as a measure to steady health
Q: A professor suspects that recent testing will lead to greater retention of course material in a…
A: Given information: The descriptive statistics for the two groups is given.
Q: he issue/scenario: A bio-tech firm has provided you with 1 years’ worth of sales for a sample of 45…
A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…
Q: The issue/scenario: A bio-tech firm has provided you with 1 years’ worth of sales for a sample of 45…
A: From the given information, there are two groups in Engineer category, 'No' and 'Yes'. The…
Q: I’m being asked to construct an anova table to compare the effects of three drugs, drug a(control) ,…
A: The provided information is as follows:The objective of the given example is to determine which…
Q: Airbnb is an online marketplace used by many travelers when booking lodging all over the world. The…
A: We would like to study the relationship between number of reviews (counts) and price (in dollars)…
Q: A researcher conducts an independent-measures study examining how the brain chemical serotonin is…
A: A. Null and alternate hypotheses: The investigator is specifically interested to test whether the…
Q: Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such…
A: Given Data : Women- 4,3, 5, 2,4 Men- 2, 0, 1 ,2, 1 We have to calculate mean and standard…
Q: A researcher randomly assigns participants to receive either a vaccine or a placebo, and number of…
A: Statistics is an essential branch of mathematics that plays a vital role in various fields,…
Q: You are conducting a study to analyze gender differences in neurocognitive impairment (NCI) within a…
A: We are conducting a study to analyze gender differences in neurocognitive impairment (NCI) within a…
Q: State the assumptions for one-way fixed effects model and the one-way random effects model.
A: Fixed Effects : It is assumed that 1)ε i ( j ) is normally and independently distributed with a mean…
Q: Males under the age of 25 must pay far higher auto insurance premiums than females in this age…
A: Let SD be Statistical Discrimination
Q: The effects of heat stresses on the heat shield of the Crew Dragon spacecraft during re-entry was…
A: It is given that the effects of heat stress on the heat shield of the Crew Dragon spacecraft during…
Q: A research study was conducted about gender differences in "sexting." The researcher believed that…
A: Solution:- from given information claim: The proportion of girls sending sexts is less than the…
Q: Part 1 of 4 A doctor in Baltimore wants to know whether the average life span for heart disease…
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Q: No need to answer in detail Coronavirus is the most dangerous specially in adults where the…
A: Given the case that children of adults were asked to fill in the questions. 64% control participated…
Q: What is the relationship between socioeconomic status and academic achievement in elementary school…
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Q: ighteen participants took part in an experimental study that consisted of three levels: normal…
A: It is given that there are 18 participants in the exam and the exam is based on 3 levels. 1). normal…
Q: Identify the independent variable (and categories) and the dependent variable. Explain a…
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Q: The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among smokers. The death…
A: Given Number of population is, N=100,000. Death rate for lung cancer among non-smokers is, L(ns)=7.…
Q: Which of these formulas is correct? a. Differences in Means = Average Causal Effect - Selection…
A: Finding the correct formula
Q: Using the latest in medical technology, an orthopedic doctor has developed a new surgical procedure…
A:
Q: A researcher is studying the effects of his newly created lens on vision. He samples 9 people with…
A: Given data: Participant With Lens Without Lens 1 8 14 2 6 17 3 9 12…
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- A researcher collects data from a sample of children with Crohn's disease and then compares that data to data collected from a sample of children without the disease. What type of study design is the researcher using for this study? Cohort Cross-sectional Quasi-experimental Case-ControlWhy would the following be conducted using a Simple Anova test? You work at an alcohol and substance abuse center and run a youth program. You want to determine which intervention works best to build self-esteem for youth in your program. Currently youth are in one of three intervention modes - (1) group counseling, (2) individual counseling and (3) a group and individual combo. Because of time constraints, you are only able to measure self-esteem at one point in time. You use a standardized multi item self-esteem scale to evaluate their level of self-esteem after 8 weeks of the intervention.Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?
- A 2x2 experiment looks at how obesity and hunger affect the amount of food people eat. The results are shown below. n=10 participants per condition. Additional info if needed: N=40, G=120, ∑?2=640∑x2=640 please conduct a twoway ANOVA and draw conclusions about the main effects and interaction of obesity and hunger on food intake. Obesity (Factor B) B1 (Obese) B2 (normal weight) Hunger A1 (not hungry) M=4 SS=50 M=1 SS=30 Factor A A2 (hungry) M=5 SS=60 M=2 SS=40These 2 questions go hand to handThink of a research scenario for which either 1-way or 2-way ANOVA would be needed to analyze the results.
- Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such as basketball, soccer, and volleyball. National collegiate athletic association injury data show that female athletes injure the ACL more frequently than their male counterparts do. A sports medicine professor wants to test this claim. He surveyed 5 universities that had both men's and woman's basketball, soccer, and volleyball and asked them how many grade 3 ACL tears they had during the past 5 seasons. Using the following results, are women at greater risk than men for ACL injuries? (use a standard deviation of 0.01, one tail test). Women- 4,3, 5, 2,4 Men- 2, 0, 1 ,2, 1 What is the difference between a repeated measure study and a matched pairs study?Part 1 of 4 A doctor in Oklahoma City wants to know whether the average life span for heart disease patients at four hospitals in the city differ. The data below represents the life span, in years, of heart disease patients from each hospital. Perform an ANOVA test with a 10% level of significance to test whether the average life span of heart disease patients in Oklahoma City differs depending on the hospital that treats them Life Span of Patients Treated at Hospital 1: 8.1, 1.2, 7, 11.5, 21, 2, 15.3, 19.2, 10.5, 15.4, 12.7, 15.3, 12.1, 7.5, 11.4, 16.4, 26.7, 14.6, 1.5, 16.3, 12.6, 0.8, 18.2, 4.2, 9.6, 21, 16.3, 2.7 Life Span of Patients Treated at Hospital 2: 17.6, 11.6, 16.8, 5.2, 6.7, 3.2, 13.8, 12.5, 0.9, 6, 14.3, 1.8, 14.8, 10, 5.8, 15.2, 10, 3.7, 11.4, 21.6, 12.9, 0.5, 9.2, 13.9, 10.9 Life Span of Patients Treated at Hospital 3: 8.5, 2.3, 11, 7.4, 14.8, 5.8, 11, 3.4, 10.9, 1.1, 5.9, 21.6, 12.5, 0.1, 15.5, 15.4, 0.8, 7.7, 5.6, 12, 7.1 Life Span of Patients Treated at Hospital 4:…Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such as basketball, soccer, and volleyball. National collegiate athletic association injury data show that female athletes injure the ACL more frequently than their male counterparts do. A sports medicine professor wants to test this claim. He surveyed 5 universities that had both men's and woman's basketball, soccer, and volleyball and asked them how many grade 3 ACL tears they had during the past 5 seasons. Using the following results, are women at greater risk than men for ACL injuries? (use a standard deviation of 0.01, one tail test). Women- 4,3, 5, 2,4 Men- 2, 0, 1 ,2, 1 Calcualte the sum of squares of injuries for men.
- Your state is going to vote on becoming a "right to work" state in the next, and you wonder if there is there a relationship between salary levels and unionization. You find data on salary from the U.S. Census, which is split into three groups: Low; Moderate/About Average, and; High. To see if salary, measured in this way, is associated with unionization you find a variable in the same dataset called "UNION", which has two categories: the respondent has a unionized job and the respondent does not have a unionized job. Because you want to know if you should favor or oppose becoming a "right to work" state, you test these two variables to see if there is an association between salary level and unionized labor. What type of hypothesis test is most appropriate?Please help me I tried multiple times, but still getting it wrongA team of epidemiologists at the Mayo Clinic wanted to find whether there is an association between obesity and cardiovascular disease (CVD). They conducted a prospective cohort study following obese and non-obese individuals who were free of CVD at the beginning of study for five years. The investigators were also interested in assessing age as a potential confounder, effect modifier, or both. Use the data below to answer the accompanying questions. CVD No CVD Total Obese 10 90 100 Not Obese 35 465 500 Total 45 555 600 CVD No CVD Total Obese 36 164 200 Not Obese 25 175 200 Total 61 339 400 1. Compute the appropriate measure of association for those who were less than age 50. 2. Compute the appropriate measure of association for those who were older or equal to age 50. 3. Compute the crude measure of association? 4. List three attributes that age must satisfy before it could…
