There is a strong correlation between the number of ashtrays in a person's home and theirlikelihood of having lung cancer. The more ashtrays, the more likely a person in the home is todevelop lung cancer. So ... ashtrays cause lung cancer?O No, this is an example of the directionality problemO No, this is an example of both the directionality and the third variable problemsO Yes, clearly there is causality hereO No, this is an example of the third variable problem

Correlation is a statistical method for determining the linear relationship between two quantitative…

Answered: There is a strong correlation between…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Answer the following 1. State whether each situation involves one-variable data or two-variable data. Give reasons for your answer. a) Kaleigh heard that more people are born in August than in any other month. She would like to check this. b) A team of scientists in Antarctica concluded that there is a connection between atmospheric carbon dioxide levels and global temperatures.
New Situation: Many meteorologists track named storms, particularly those that have the potential to make landfall; some meteorologists are more successful in predicting the track of the storm than others. Suppose all currently employed meteorologists are identified as either being employed by the U.S. National Weather Service, employed by a local television station within the United States, or employed in a country other than the United States. In this scenario, what is the population of interest?
To that end let X and Y to be two variables and suppose we have collected data on both of them from an underlying population: X1. X2......Xn V₁, V2, ... Yn Two-way table can be constructed in three different cases. Obs Gender 1 2 3 4 EX: We have collected data on Salary, Education, Gender, and Working Hours from all 10 employees. of a Tech company in Kabul. Education Salary 5 6 7 8 9 10 M M F F F M M M M M HS BA PowerPoint Slide Show- (BivarPart1.pptx)]-PowerPoint Bivariate Analysis: Two way Table Two way Table: 3: Working hrs and Salary: MA MA PHD MA BA BA HS BA 10 20 30 35 50 38 25 23 15 26 Working Hrs 6 8 9 9 10 9 8 7 6 7 Whr8 Total Sal 20 2 0 0 2 [20-30) 0 4 0 4 Sal> 30 0 0 4 4 Total 2 4 4 10 Fr(Whr =30)= 4 MULTIPLE CHOICE QUESTION 0 Rewatch Submit
Which of the following is true regarding the difference between an observational study and an experiment? An experiment must have a control group while the observational study does not. An observational study is used for human subjects while an experiment is used for non-human subjects. In an experiment, the investigator randomly places subjects into treatment and control groups while in an observational study, no treatments are administered. The observational study can produce causal results while an experiment can only identify an association. None of these is true.
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.
The researcher receives funding to also study disease Y and finds the following: disease Y death rate per 100,000 for ME is 72 and for NE is 45. Which of the following is the true statement? The researcher receives funding to also study disease Y and finds the following: disease Y death rate per 100,000 for ME is 72 and for NE is 45. Which of the following is the true statement? Meat - eating seems to be more causally related to Disease Y than Disease The etiologic fraction ( attributable fraction) of Disease Y is 1.6 The population etiologic fraction (population attributable fraction) of Disease Y is 67%. None of the above
How can answer these questions? And write
4. An experimenter studies vision in low light by having participants sit in a darkened room for 5, 15, or 25 minutes and then tests their ability to correctly identify 20 objects. What is te independent variable? Give the levels of the independent varibale - What is the level of measurement of the independent variable? What is the dependent variable? - What is the level of measurement of the dependent variable? - Would you use the values from the independent variable or the dependent variable to create a frequency distribution?
Having a brother increases one's monthly earnings by $200." Why is this an example of an incomplete causal statement?
PLEASE DONT USE EXCEL
We discuss how to test for an association between two categorical variables in Section 6.8. A marine research team records the number of fish from 3 species that they find at different depth categories in the ocean. They are interested in assessing whether or not there is a relationship between the depth category (close to surface, mid-level, ocean floor) and the fish species found (species A, species B, species C). A two-way table showing the classification of a sample of 150 observations is given below. If the variables for the ocean depth category and the species are independent, how would you calculate the expected number of fish that are at the mid-level and from species C? Expected number =
1) For each of the following pairs of variables, is there likely to be a positive association, a negative association or no association? Briefly explain your reasoning. (a) Amount of alcohol consumed and performance on a test of coordination. (CHOOSE ONE) i) There is likely to be a positive association. As alcohol consumption increases, performance on a test of coordination will tend to increase. ii) There is likely to be a negative association. As alcohol consumption increases, performance on a test of coordination will tend to decrease. iii) No association would be expected between amount of alcohol consumed and performance on a test of coordination. (b) Height and grade point average for university students. i) There is likely to be a positive association. As height increases, grade point average for university students will tend to increase.There is likely to be a negative association. As height increases, grade point average for university students will tend to decrease.…

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