Answered: What effect does an outlier have on a…

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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Whn determining whether there is a correlation between two variables ,one should use a to explore the data visually.
An environmentalist wants to determine the relationships between the numbers (in thousands) of forest fires over the year and the number (in hundred thousands) of acres burned. The data for 8 recent years are shown. Required: Find the correlation coefficient. Only the final answer should be rounded-off to TWO decimal places.
A statement is made about correlation. State whether the correlation is positive or negative and whether the correlation is most likely due to coincidence, a common underlying cause, or a direct cause. If there is an underlying cause, state what the underlying cause is. If one directly causes the other, state which is the cause and which is the effect.(a) In Angela's class, the taller students got lower scores on the test.(b) As Thomas's income rose over the last 20 years so has his stress level.
How can you interpret a correlation value of .885? Moderate, Negative, Direct No Relationship Moderate, Positive, Inverse Strong, Positive, Direct
Explain what correlation is and why two variables might be described as having a negative correlation. Age and education: A survey of U.S. adults showed that there is a negative correlation between age and education level. Does this mean that people become less educated as they become older? why or why not?
What would be the effect of an "outlier " on a correlation /regression analysis ? It will tend to decrease the strength of a relationship only if the relationship is direct . It will tend to increase the strength of a relationship only if the relationship is positive. It will tend to increase the strength of a relationship . It will tend to decrease the strength of a relationship .
How are linear correlation tests and t-tests similar?
When doing a correlational analysis, three possible results may occur. Define what does positive correlation, negative correlation and no relationship means.
Two variables are found to have a strong positive linear correlation. Pick the correct statement. An increase in one variable potentially causes a decrease in the other. An increase in one variable does not cause a decrease in the other. An increase in one variable does not cause an increase in the other. An increase in one variable potentially causes an increase in the other. An increase in one variable causes a decrease in the other. An increase in one variable causes an increase in the other.
A scatterplot of two variables is a picture of the relationship represented in a correlation. Group of answer choices True False
Explain correlation and its importance.
Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 32 75 y 40 35 30 26 18 (a) Make a scatter diagram of the data and visualize the line you think best fits the data. Flash Player version 10 or higher is required for this question. You can get Flash Player free from Adobe's website. (b) Would you say the correlation is low, moderate, or strong? positive or negative? strong and negative moderate and negative strong and positive low and negative low and positive moderate and positive (c) Use a calculator to verify that Σx = 132, Σx2 = 6932, Σy = 149, Σy2 = 4725, and Σxy = 2997. Compute r. (Round your answer to three decimal places.)r = As x increases, does the value of r imply that y should tend to increase or decrease? Explain. Given our value of r, we cannot draw any conclusions for the behavior of y as x increases. Given our value of r, y should tend to…

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What effect does an outlier have on a correlation coefficient? Would it increase, decrease or stay the same?