Reading 11: Correlation and Regression-LOS a, (Part 2)习题精选 2010, number, between, determine, face

土豆妮

Session 3: Quantitative Methods: Quantitative
Methods for Valuation
Reading 11: Correlation and Regression

LOS a, (Part 2): Interpret a scatter plot.

 

 

 

Thomas Manx is attempting to determine the correlation between the number of times a stock quote is requested on his firm’s website and the number of trades his firm actually processes. He has examined samples from several days trading and quotes and has determined that the covariance between these two variables is 88.6, the standard deviation of the number of quotes is 18, and the standard deviation of the number of trades processed is 14. Based on Manx’s sample, what is the correlation between the number of quotes requested and the number of trades processed?

A) 0.35.

B) 0.78.

C) 0.18.

土豆妮

Thomas Manx is attempting to determine the correlation between the number of times a stock quote is requested on his firm’s website and the number of trades his firm actually processes. He has examined samples from several days trading and quotes and has determined that the covariance between these two variables is 88.6, the standard deviation of the number of quotes is 18, and the standard deviation of the number of trades processed is 14. Based on Manx’s sample, what is the correlation between the number of quotes requested and the number of trades processed?

A) 0.35.

B) 0.78.

C) 0.18.

---

Correlation = Cov (X,Y) / (Std. Dev. X)(Std. Dev. Y)
Correlation = 88.6 / (18)(14) = 0.35

土豆妮

In the scatter plot below, the correlation between the return on stock A and the market index is:

A) positive.

B) negative.

C) not discernable using the scatter plot.

土豆妮

In the scatter plot below, the correlation between the return on stock A and the market index is:

A) positive.

B) negative.

C) not discernable using the scatter plot.

---

In the scatter plot, higher values of the return on stock A are associated with higher values of the return on the market, i.e. a positive correlation between the two variables.

---

土豆妮

If the correlation between two variables is ?1.0, the scatter plot would appear along a:

A) straight line running from northwest to southeast.

B) straight line running from southwest to northeast.

C) a curved line running from southwest to northeast.

土豆妮

If the correlation between two variables is ?1.0, the scatter plot would appear along a:

A) straight line running from northwest to southeast.

B) straight line running from southwest to northeast.

C) a curved line running from southwest to northeast.

---

If the correlation is ?1.0, then higher values of the y-variable will be associated with lower values of the x-variable. The points would lie on a straight line running from northwest to southeast.

土豆妮

Which of the following statements regarding scatter plots is most accurate? Scatter plots:

A) illustrate the relationship between two variables.

B) illustrate the scatterings of a single variable.

C) are used to examine the third moment of a distribution (skewness).

土豆妮

Which of the following statements regarding scatter plots is most accurate? Scatter plots:

A) illustrate the relationship between two variables.

B) illustrate the scatterings of a single variable.

C) are used to examine the third moment of a distribution (skewness).

---

A scatter plot is a collection of points on a graph where each point represents the values of two variables. They are used to examine the relationship between two variables.

maxsimax

thanks

luqian55

THANK YOU