QUESTION 12Which of the following suggests a strong correlation between x and y?Or-oOre-0.20.2r=-0.9Or-0.5QUESTION 13nter is interested in determining if there is a dinn wait time for a samplewer (4

Here we have to choose the value of r that represent strong correlation

Answered: QUESTION 12 Which of the following…

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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4.40 Sloppy Writing about Correlation. Each of the following statements contains a blunder. Explain in each case what is wrong. “There is a high correlation between the gender of an adult and and their political affiliation.” “We found a strong negative correlation (r=−1.09) between the amount of time spent on social media and the number of books read in the last year.” “The correlation between height and weight of the subjects was r=0.63 centimeter per kilogram.”
Question 12 An analysis of variance experiment produced portions of a company ANOVA table Source of variations S.S Between groups Within groups d.f MS 25.08 Fral 3 a C. Total 117.72 79 N.B F(3,76)5% 2.724 and F3 79, 5% = 2.70 1. Specify the competing hypothesis in order to determine the population means. 2. Find the missing statistics a, b and c in the ANOVA table. 3. At the 5% significant level, what is the conclusion to the test? • Paragraph B IU A A I E E I I * x, E E E- & V G D I T 12pi
31
Question: 3. A friend of yours is studying the relationship between two variables (X and Y), and has come to you for some help. He starts by showing you the following sample statistics, obtained from a group of 20 subjects: X-bar = 43.9 Y-bar = 70.65 SX = 22.391 SY = 18.695 Unfortunately, he lost his only copy of the original raw scores before computing the correlation between X and Y, but he does remember that a Y-hat score of 41.154 corresponded to an X score of 0. a) What is the value of b1 and is it significantly different from 0? (α ≤ .05) b) What percentage of the variance in Y can be explained by X? Is this a significant amount? (α ≤ .05) c) Compute the predicted Y-hat score for a person with an X score of 25. Answer: 3.a) .672, t = 5.753, Reject H0: the slope is significantly different from 0. b) 64.8%, t = 5.753, Reject H0: the correlation is significantly different from zero. c) 57.954
Which of the following is not a cause of perfect multicollinearity? Select all that apply. One of the explanatory variables is equal to half of another explanatory variable for 100% of the observations in the sample. The correlation between two of the explanatory variables is 1.00. One of the explanatory variables is equal to half of another explanatory variable for 20% of the observations in the sample. A dummy variable for male is included at the same time as a dummy variable for non-male. One of the regressors is X and another regressor is X².
2. Which of the following values cannot be a correlation coefficient? Group of answer choices -.274 1.473 -.650 .615
QUESTION 8 The relationship between the sales per month (in AED 1000) and the number of employees for all the outlets of a large. computer chain is linear. Based on a random sample of 56 pairs, the associated coefficient of correlation is 0.45. At 0.05 significance level, we want to test whether there is a significant correlation between sales per month and number of employees. Compute the test statistic of the test. Round your answer to three decimal places.
The scatterplot below shows the relationship between two random variables X and Y. (a) Is the correlation a good metric for describing the relationship between X and Y for these data? Why or why not? Regardless of your answer suppose you calculated the sample correlation between X and Y and found that r = -0.15. Explain in one sentence what this means. (b) If, as noted in (a), r = -0.15 then what is the value of the correlation between 2X and 5Y? (c) Based on (b) draw your best approximation to the least squares regression line that fits the data above. Also, make a rough sketch of the corresponding residual plot.

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QUESTION 12 Which of the following suggests a strong correlation between x and y? Or-0 Or-0.2 r--0.9 Or-0.5 QUESTION 13 ter is interested in determining if there is a dif nn wait time for a sample