Homework Answers
QUESTION : If a researcher obtained an r of -0.85 , what could you sayabout this correlation ?
ANSWER : This is a strong negative correlation
QUESTION 4 : If a researcher wanted to see cumulative GPA predicts GRE scores , which of the two variables would be predictor variable ?
ANSWER : Cumulative GPA
QUESTION 5 : Which of the foolowing statement true of correlation coefficient ?
ANSWER : A correlation coefficient of -0.90 indicates that you can be confident of predictions you make about these variables.
QUESTION 8 : How do you calculate the coefficient of determination (AKA the proportion of variance accounted for)?
ANSWER : You square your r value
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If a researcher obtained an r of -0.85, what could you say about this correlation? -...
Question 1 1 pts The correlation between score and first year GPA is 0.529. What is...
Question 1 1 pts The correlation between score and first year GPA is 0.529. What is the critical value for the testing if the correlation is significant at a =.05? Question 2 1 pts To determine if the correlation is significant, what rule is used? correlation is significant if r<.05 correlation is significant if |r| < critical value O correlation is significant if r>.05 correlation is significant if |r| > critical value Information for questions 1-6: A graduate program wants...
Determine if the following statement is true or false. A correlation coefficient close to 1 is...
Determine if the following statement is true or false. A correlation coefficient close to 1 is evidence of a cause-and-effect relationship between the two variables. The statement is true O A. False. Only a correlation coefficient close to 0 indicates a cause-and-effect relationship between the two variables O B. False. A correlation coefficient should not be interpreted as a cause-and-effect relationship O c. True, but only if all the conditions for correlation are met. False. A correla.on coefficient of 1...
A graduate program wants to determine if first year graduate student GPA,y, Is linearly related to...
A
graduate program wants to determine if first year graduate student
GPA,y, Is linearly related to score on the quantitative section of
the GRE,x, (Graduate Recored Examinations).
Data was collected from 15 randomly selected graduate
students. Scores on the quantitative secrion of the GRE ranged from
480 to 720.
1. To determine if the correlation is significant, what rule
is used?
a. correlation is significant if |r| > critical
value.
b. correlation is significant if |r| < critical value
c....
please answer all questions : 6-8 Question 6 1 pts A researcher examines the relationship between...
please answer all questions : 6-8
Question 6 1 pts A researcher examines the relationship between an individual's adjustment to becoming a parent and his/her age, while removing the influence of financial status. What procedure would allow such an analysis? o mixed correlation o split-half reliability o spurious correlation o partial correlation MULTIPLE CHOICE - 2 POINTS EACH Question 7 2 pts A researcher is interested in whether there are significant differences between men and women and religious preferences. In...
Question 24 2 pts Arnold calculates a Pearson correlation and obtains a value of -1.07. By...
Question 24 2 pts Arnold calculates a Pearson correlation and obtains a value of -1.07. By definition, this implies he has made a mistake in his calculations there is a negative and strong relationship between the two variables the distribution of scores for the variables are negatively skewed he will not reject the null hypothesis Question 25 2 pts For which of these research situations would you most likely calculate a Pearson correlation? X variable = political affiliation; Y variable...
Correlation Can a Pearson's r value be great than 1 or less than -l? Why or...
Correlation Can a Pearson's r value be great than 1 or less than -l? Why or why not? How do we calculate Pearson's r? How do we calculate df for a correlation? o What does the covariance represent mathematically? 0 How many standard deviations do we need to calculate to calculate the r value? 0 What is an example of an r value that represents a strong correlation, what about a weak correlation? What is the r value associated with...
What information does R (that is, r-squared) provide in general about the fit of a regression...
What information does R (that is, r-squared) provide in general about the fit of a regression model? It is exactly equal to the correlation between X and Y. It tells us the proportion of variability in the dependent variable, Y, that is explained by the model. It tells us the proportion of variability in the independent variable, X, that is explained by the model We should keep choosing different independent variables until R equals 1 O The closer R is...
(8 points) Match the following sample correlation coefficients with the explanation of what that correlation coefficient...
(8 points) Match the following sample correlation coefficients with the explanation of what that correlation coefficient means. Type the correct letter in each box. 1. r = -.15 2. r = 0 3. r = 1 4. r = -97 A. a strong negative relationship between x and y B. no relationship between x andy C. a weak negative relationship between x and y D. a perfect positive relationship between x and y Note: You can earn partial credit on...
Question 26 O pts BONUS: A researcher calculated the correlation coefficient between hours studied and test...
Question 26 O pts BONUS: A researcher calculated the correlation coefficient between hours studied and test grades as r = 0.60. If she then decided to transform the variable hours studied to minutes studied what would happen to the correlation coefficient? (1 point) Explain your response. (1 point) HTML Editor B U А Tx E Ex? 用 2 x C TTT 12pt Paragraph O words
Which of the following is false and WHY (Important that you say why)? a) P (ANB)...
Which of the following is false and WHY (Important that you say why)? a) P (ANB) = P ( BA) b) P (AUB) = P (BUA) c) P (A complement) = 1-P(A) d) P(AB) = P(BIA) The variable "Industry Price" and "Sales Volume" have a correlation coefficient of -0.23. Identify the correct statement and WHY this statement is correct: a) If industry prices go up, sales volume goes down. The linear relationship between the two variables is strong. b) If...
Question 1 1 pts The correlation between score and first year GPA is 0.529. What is the critical value for the testing if the correlation is significant at a =.05? Question 2 1 pts To determine if the correlation is significant, what rule is used? correlation is significant if r<.05 correlation is significant if |r| < critical value O correlation is significant if r>.05 correlation is significant if |r| > critical value Information for questions 1-6: A graduate program wants...
Determine if the following statement is true or false. A correlation coefficient close to 1 is evidence of a cause-and-effect relationship between the two variables. The statement is true O A. False. Only a correlation coefficient close to 0 indicates a cause-and-effect relationship between the two variables O B. False. A correlation coefficient should not be interpreted as a cause-and-effect relationship O c. True, but only if all the conditions for correlation are met. False. A correla.on coefficient of 1...
A
graduate program wants to determine if first year graduate student
GPA,y, Is linearly related to score on the quantitative section of
the GRE,x, (Graduate Recored Examinations).
Data was collected from 15 randomly selected graduate
students. Scores on the quantitative secrion of the GRE ranged from
480 to 720.
1. To determine if the correlation is significant, what rule
is used?
a. correlation is significant if |r| > critical
value.
b. correlation is significant if |r| < critical value
c....
please answer all questions : 6-8
Question 6 1 pts A researcher examines the relationship between an individual's adjustment to becoming a parent and his/her age, while removing the influence of financial status. What procedure would allow such an analysis? o mixed correlation o split-half reliability o spurious correlation o partial correlation MULTIPLE CHOICE - 2 POINTS EACH Question 7 2 pts A researcher is interested in whether there are significant differences between men and women and religious preferences. In...
Question 24 2 pts Arnold calculates a Pearson correlation and obtains a value of -1.07. By definition, this implies he has made a mistake in his calculations there is a negative and strong relationship between the two variables the distribution of scores for the variables are negatively skewed he will not reject the null hypothesis Question 25 2 pts For which of these research situations would you most likely calculate a Pearson correlation? X variable = political affiliation; Y variable...
Correlation Can a Pearson's r value be great than 1 or less than -l? Why or why not? How do we calculate Pearson's r? How do we calculate df for a correlation? o What does the covariance represent mathematically? 0 How many standard deviations do we need to calculate to calculate the r value? 0 What is an example of an r value that represents a strong correlation, what about a weak correlation? What is the r value associated with...
What information does R (that is, r-squared) provide in general about the fit of a regression model? It is exactly equal to the correlation between X and Y. It tells us the proportion of variability in the dependent variable, Y, that is explained by the model. It tells us the proportion of variability in the independent variable, X, that is explained by the model We should keep choosing different independent variables until R equals 1 O The closer R is...
(8 points) Match the following sample correlation coefficients with the explanation of what that correlation coefficient means. Type the correct letter in each box. 1. r = -.15 2. r = 0 3. r = 1 4. r = -97 A. a strong negative relationship between x and y B. no relationship between x andy C. a weak negative relationship between x and y D. a perfect positive relationship between x and y Note: You can earn partial credit on...
Question 26 O pts BONUS: A researcher calculated the correlation coefficient between hours studied and test grades as r = 0.60. If she then decided to transform the variable hours studied to minutes studied what would happen to the correlation coefficient? (1 point) Explain your response. (1 point) HTML Editor B U А Tx E Ex? 用 2 x C TTT 12pt Paragraph O words
Which of the following is false and WHY (Important that you say why)? a) P (ANB) = P ( BA) b) P (AUB) = P (BUA) c) P (A complement) = 1-P(A) d) P(AB) = P(BIA) The variable "Industry Price" and "Sales Volume" have a correlation coefficient of -0.23. Identify the correct statement and WHY this statement is correct: a) If industry prices go up, sales volume goes down. The linear relationship between the two variables is strong. b) If...
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