If X and Y are independent the correlation cofficient between X and Y is not equal zero ylgn ihi

Q: (a) For these 25 students, as the time spent texting increases, the time spent exercising tends to…

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Q: For a set of values of x and y, if Pearson's Correlationris equal to - 0.97, it means: x and y have…

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Q: An equity analyst is required to calculate the correlation coefficient between two securities, ABC…

A: In this case, Cov(X,Y) is the covariance between X and Y, sx is the standard deviation of x and sy…

Q: Suppose the Pearson correlation between X and Y is -0.4567. Now I create a new variable Z = 4 - 8*X,…

A: Correlation between X and Y = -0.4567 So, ρXY = -0.4567 Now, Z = 4-8X Hence, Var(Z) = 82 Var(X)…

Q: A computer while calculating the correlation coefficient between two variates X and Y obtained the…

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Q: A correlation of r = +0.45 will result in more accurate predictions than a situation where r =…

A: A correlation of r = +0.45 will result in more accurate predictions than a situation where r =…

Q: in) Find the auto correlation function and its PSD. ) Find the Mean and Variance of Y (t)

A: Answer: For the given data

Q: A researcher computes the correlation coefficient r =r= 0.6939 for an explanatory and response…

A: Given : Correlation coefficient = r = 0.6939

Q: Suppose that the correlation r between two quantitative variables was found to be r = 0.  This means…

A: Solution: Correlation: Two variables are said to be correlated if there is a linear association…

Q: A perfect straight line sloping downward would produce a correlation coefficient equal to: O A. -1…

A: Given that ; A perfect straight line sloping downward would produced a correlation…

Q: on coefficient was –0.99. Would it be accurate to use this equ because that would be extrapolation.…

A: Given that the least squares regression line is, y=35035.71-4142.86x  The correlation coefficient is…

Q: If the correlation coefficient obtained from data pairs of variables X and Y is -0.74 the strength…

A: Correlation between two variables measure the strength and direction between two variables. It…

Q: If two variables X and Y have a positive correlation, then a. the point in the scatter plot lie in…

A: 4) Correlation coefficient: Correlation coefficient is used to measures strength of the association…

Q: In order to indicate a strong correlation between variables, the correlation coefficient will be…

A: In this case, we need to identify the correct option.

Q: If correlation of X and Y is equal to 0, prove that correlation of x< and y may not be equal to 0.

A: Correlation: Correlation analysis is used to measure the strength of the association between…

Q: In soccer, it seems reasonable to assume that the more shots a team takes, the more goals they will…

A: 1. Even if the correlation is found to be statistically significant, that does not necessarily mean…

Q: The article "Behavioural Effects of Mobile Telephone Use During Simulated Driving"t reported that…

A: Concept:  Correlation is the measure of degree of linear relationship between two variables.

Q: A researcher wants to determine if the exam scores of the students are dependent on the length of…

A: X Y X.Y X.X Y.Y 1.5 80 120 2.25 6400 3.0 83 249 9 6889 1.25 83 103.75 1.5625 6889 0.5…

Q: The computed Spearman correlation coefficient between the price and weight of randomly selected cars…

A: Here we want to know given statement is true or not

Q: Because a partial correlation considers the influence of a third variable, it is possible to have a…

A: From the above question Because a partial correlation considers the influence of a third variable,…

Q: To study the correlation between the weights and heights of the students of a college, a sample of…

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Q: If x and y are two uncorrelated variables and u=x+y, v =x- y, find the coefficient of correlation…

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Q: Which value of r indicates a stronger correlation than +0.40 0.38 -0.30 -0.80 0

A: r (correlation coefficient): Measure of linear association between two variables.

Q: An r value of –0.9 indicates a strong negative correlation.  True  False

A: It is an important part of statistics . It is widely used .

Q: (a) For these 24 students, as the number of hours increases, the amount of money spent tends to…

A: From the above diagram, the answer can be given as, (a) For these 24 students, as the number of…

Q: If the coefficient of determination is equal to 1, then the correlation coefficient A. must also be…

A: Coefficient of determinations r2: The coefficient of  determination  determines the percentage of…

Q: the strength of correlation is indicated by: both (a) and (b) (B) its sign (+ or -) None of the…

A: the strength of correlation is indicated by

Q: If the correlation coefficient between variables X and Y is roughly zero, then ______. Y is…

A: If the correlation coefficient of two variables is zero, there is no linear relationship between the…

Q: Describe about t RATIO FOR A SINGLE POPULATION CORRELATION COEFFICIENT.

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Q: A strong positive correlation means: the points in a scatter diagram lie on a downward sloping line…

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Q: When calculating a correlation coefficient between two continuous variables, the scales on which the…

A: Correlation: By correlation we mean the association or interdependence between two variables. If two…

Q: Suppose we compute a correlation coefficient between two variable of r= 0. Which of the following…

A: Given Information: Correlation coefficient between two variables is 0 i.e., r = 0 Correlation…

Q: If r= +1, the correlation is said to be a O Perfect negative correlation O Perfect positive…

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Q: An analyst takes a sample of 10 households and records their weekly consumption expenditure (in RM)…

A: To answer this question we have to know about correlation and its properties

Q: 17) What assumptions are required for a correlation to be a valid description of the relation…

A: Assumptions for correlation: Correlation quantifies the extent to which two quantitative variables.…

Q: Calculate the Coefficient of Correlation between the values of X and Y from the data iven below :…

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Q: A set of n = 5 pairs of X and Y values has SSX = 10, SSY = 40 and Sum of product ()= 10.  For these…

A: The Pearson correlation measures the relationship between two variables X and Y. The Pearson…

Q: If you have 10 variables when computing correlation coefficients how many unique coefficients will…

A: It is provided that there are a total of 10 variables for which the correlation coefficients are…

Q: For a data set of chest sizes (distance around chest in inches) and weights (pounds) of twelve…

A: The linear correlation coefficient is r=0.732 and the data consists of 12 anesthetized bears. Let ρ…

Q: The correlation coefficient O a. can be less than -1 b. is the same as the covariance C. cannot be…

A: We have to find the coreation coefficient.

Q: The coefficient of correlation is independent of the change of origin and scale of measurements.

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Q: aper concluded that there was a correlation between refined sugar consumption (calories per person…

A: Correlation is correct.

Q: Suppose Y1, Y2 and 3Y are not correlated variables, however, have the same standard deviation. Show…

A: Given  Y1 , Y2, Y3 are independent of each other.  They have same standard deviations

Q: If there is a very strong correlation between two variables, then the correlation coefficient must…

A: Correlation provides the linear relationship between two variables and it does not take into…

Q: A negative correlation means that decreases in the X variable tend to be accompanied by decreases in…

A: A negative correlation means if x decreases, then y will increase or vice versa.

Q: A correlation of r=1.2 is not possible? Define?

A: Given that, A correlation of r=1.2

Q: If the correlation coefficient obtained from data pairs of variables X and Y is 0.98 the strength…

A: correlation coefficient The correlation coefficient r measures the direction and strength of a…

Q: If X has a mean μ and variance σ and Y = aX+b where a and b are constants: Find the mean, variance,…

A: Given, Mean, E(X)= mu Variance = E(X2)- (E(X))2 = sigma From this equation we can calculate the…