Answered: general, if two variables are strongly…

general, if two variables are strongly associated, does it follow there must be a cause and effect relationship between them? Explain

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A study provides data on variables that may be related to the number of weeks a manufacturing worker has been jobless. The dependent variable in the study (Weeks) was defined as the number of weeks a worker has been jobless due to a layoff. The following independent variables were used in the study. Age The age of the worker Educ The number of years of education Married A dummy variable; 1 if married, 0 otherwise Head A dummy variable; 1 if head of household, 0 otherwise Tenure The number of years on the previous job Manager A dummy variable; 1 if management occupation, 0 otherwise Sales A dummy variable; 1 if sales occupation, 0 otherwise The data are available in the file named Layoffs.MTW. Develop an estimated regression equation that can be used to predict the number of weeks a worker has been jobless due to a layoff given age, education and marital status of the worker. Develop an…
A police academy has just brought in a batch of new recruits. All recruits are given an aptitude test and a fitness test. Suppose a researcher wants to know if there is a significant difference in aptitude scores based on a recruits’ fitness level. Recruits are ranked on a scale of 1 – 3 for fitness (1 = lowest fitness category, 3 = highest fitness category). Using “ApScore” as your dependent variable and “FitGroup” as your independent variable, conduct a One-Way, Between Subjects, ANOVA, at α = 0.05, to see if there is a significant difference on the aptitude test between fitness groups. Identify the correct written form of the null hypothesis A. The mean fitness score between the three aptitude tests are NOT equal B. The mean aptitude score between the three fitness groups are NOT equal C. The mean aptitude score between the three fitness groups are equal D. The mean fitness score between the three aptitude tests are equal
Which of the following refers to the scenario in which the relationship between the dependent variable and one independent variable is different at different values of a second independent variable?
If a researcher found a significant interaction between Factor A and Factor B, what does this mean (in general)? O Both Factor A & Factor B have independent effects. O The effect of Factor A on the dependent variable depends on the level of Factor B. O Only Factor A is significant. none of the above.
Olivia sees that in her data there is a relationship between regular exercise and a range of health outcomes, with those doing exercise having better outcomes. Olivia can claim which of the following statements A. there is evidence of a correlation between regular exercise and health outcomes in her group of UTS academics B. there is evidence of a causal relationship between regular exercise and health outcomes in the population of UTS academics C. there is evidence of a causal relationship between regular exercise and health outcomes in her group of UTS academics D. there is evidence of a correlation between regular exercise health outcomes in the population of UTS academics O She can claim only statement A O She can claim only statement C She can claim all statements O She can claim statements A and C O She can claim statements A and D She can claim statements B and C
A group of educators want to determine how effective tutoring is in raising students' grades in a math class, so they arrange free tutoring for those who want it. Then they compare final exam grades for the group that took advantage of the tutoring and the group that did not. Suppose the group participating in the tutoring tended to receive higher grades on the exam. Does that show that the tutoring worked? If not, explain why not and suggest a confounding variable. Question content area bottom Part 1 Choose the correct answer below. A. Because this was an observational study, it only shows an association; it does not show that the tutoring worked. It could be that an insufficient number of students were studied to show that the tutoring worked. B. The study shows that the tutoring worked. C. Because this was an observational study, it only shows an association; it does not show that the tutoring worked. It could be that more motivated…
There is a strong correlation between the number of ashtrays in a person's home and their likelihood of having lung cancer. The more ashtrays, the more likely a person in the home is to develop lung cancer. So ... ashtrays cause lung cancer? O No, this is an example of the directionality problem O No, this is an example of both the directionality and the third variable problems O Yes, clearly there is causality here O No, this is an example of the third variable problem
Based on a graph below which of the following statement describes the best types of associations between Factors A, C, and D and the Disease: (choose one best answer) Factor Factor C Disease Factor A O Factor A is sufficient but not necessary, while Factors C and D and neither sufficient not necessary. O Factors A, C and D are neither sufficient nor necessary. O Factor A is necessary but not sufficient, while Factors C and D are necessary but not sufficient. O Factor A is sufficient but not necessary, while Factors C and D are neither sufficient not necessary.
I am determining how effective a Drug is at reducing inflammation in individuals infected with a virus. the serum levels of antibody are measured as a measure of inflammation (less antibodies means less inflammation which decreases virus mortality) in 30 people given placebo, 30 people given 1 unit of the drug, and 30 people given 2 units of the drug. I would like to determine what levels of the drug are effective, and if there are sex-specific effects. What are the dependent and independent variables in this experiment? age _________ sex __________ antibody level _____________ treatment ___________
What is the Independent variable and the dependent variable of this problem? A neuropsychologist is studying brainlateralization—the degree to which thecontrol of various cognitive functions islocalized more in one cerebral hemispherethan the other. This researcher is awarethat for men, being right-handed seemsto be associated with a greater degree oflateralization than does being left-handedbut that this relationship may not applyto women, who seem to be less lateralizedin general. Various tasks are used in combination to derive a lateralization scorefor each subject as shown in the followingtable.
A production manager is concerned about the low output levels of his employees. The articles that he read on job performance frequently mentioned four variables as important to job performance: skill required for the job, rewards, motivation, and satisfaction. In several of the articles it was also indicated that only if the rewards were valent (attractive) to the recipients did motivation, satisfaction, and job performance increase, not otherwise. Based on the scenario presented, answer the following questions: A) Find out Independent, Dependent, Moderating, and Mediating Variables. B) Develop Conceptual Framework C) Write 3 alternative hypotheses
A study compared different psychological therapies for teenage girls suffering from anorexia, an eating disorder that causes them to become dangerously underweight.Each girl’s weight was measured before and after a period of therapy. The variable of interest was the weight change, defined as weight at the end of the study minus weight at the beginning of the study.Two therapies were designed to aid weight gain, one of which is the cognitive behavioral therapy. This form of psychotherapy stresses identifying the thinking that causes the undesirable behavior and replacing it with thoughts designed to help improve this behavior. The changes of 29 teenage girls receiving thecognitive behavioral therapy in weight (in lbs) during the study were1.7, 11.7, -1.4, 0.7, 6.1, -0.8, -0.1, 1.1, 2.4, -0.7, -4.0, 12.6, -3.5, 20.9,1.9, 14.9, -9.3, 3.9, 3.5, 2.1, 0.1, 17.1, 1.4, 15.4, -7.6, -0.3, -0.7,1.6, -3.7The weight change was positive if the girl gained weight (which is desired) and negative if…