Question 1

In a recent study it was found that the correlation between self-esteem and depression was ?.64.Explain what this means.Calculate the coefficient of determination for this correlation and explain what information this provides.

Accepted Answer

The answer of In a recent study it was found...

Question 2

Suppose that the correlation between height and weight for adults is +.75.What proportion (or percent)of the variability in weight is accounted for by the relationship with height?

Accepted Answer

The correlation coefficient between height and weight represents the strength and direction of the linear relationship between the two variables. The correlation coefficient squared (r^2) represents the proportion of variability in weight that is accounted for by the relationship with height. Therefore, r^2 = 0.75^2 = 0.56, or 56%. So, the correct answer is C.

Question 3

Pam is interested is assessing the degree of relationship between gender and test grades in her psychology class.Pam should use the _____ correlation coefficient to assess this.

Accepted Answer

The point-biserial correlation coefficient is used to measure the relationship between a binary variable (such as gender) and a continuous variable (such as test grades).

Question 4

Explain how curvilinear relationships can be a problem when interpreting correlation coefficients.

Accepted Answer

The answer of Explain how curvilinear relationships can be a...

Question 5

If a correlation coefficient that you expected to be fairly high turns out to be very low,you should investigate whether there is a

Accepted Answer

A low correlation coefficient can result from a restrictive range or a curvilinear relationship, both of which can obscure the true relationship between variables.

Question 6

_____ is a procedure which allows us to predict an individual's score on one variable based on knowing one or more other variables.

Accepted Answer

Regression analysis is the procedure that allows us to predict an individual's score on one variable based on knowing one or more other variables. The other options, Pearson product-moment correlation coefficient, coefficient of determination, and point-biserial correlation coefficient, are types of correlation coefficients but do not directly predict an individual's score on a variable.

Question 7

In a recent study it was found that the correlation between self-esteem and depression was ?.64.Tom interprets this to mean that low levels of self-esteem lead to high levels of depression and vice versa.How is Tom misinterpreting these data?

Accepted Answer

The answer of In a recent study it was found...

Question 8

The _____ is a measure of the proportion of variance in one of the variables that is accounted for by the other variable.

Accepted Answer

The coefficient of determination, also known as R-squared, is the measure of the proportion of variance in one variable that can be explained by the other variable. It is calculated as the square of the Pearson product-moment correlation coefficient between the two variables. Therefore, option B is the correct answer. Options A and C are specific types of correlation coefficients, while option D is the correlation coefficient itself, not the measure of the proportion of variance.

Question 9

Two interval/ratio variables are to _____ coefficient and one interval/ratio variable and one nominal variable are to _____ coefficient.

Accepted Answer

The Pearson product-moment correlation is used for two interval/ratio variables, while the point-biserial correlation is used for one interval/ratio variable and one nominal variable.

Question 10

Explain when each of the correlation coefficients listed below should be used.

Accepted Answer

The answer of Explain when each of the correlation coefficients...

Question 11

Two nominal variables are to _____ coefficient and two ordinal variables are to _____ coefficient.

Accepted Answer

Phi coefficient is used for two nominal variables, and Spearman rank-order correlation is used for two ordinal variables.

Question 12

Assume that the regression equation for the relationship between SAT scores and IQ scores is y=9 + .105x.What would you expect the IQ score to be for the following individuals given their SAT scores?

Accepted Answer

The answer of Assume that the regression equation for the...

Question 13

Explain when each of the correlation coefficients listed below should be used.

Accepted Answer

The answer of Explain when each of the correlation coefficients...

Question 14

If both variables are measured on a nominal scale,what type of correlation coefficient is appropriate?

Accepted Answer

The phi coefficient is the appropriate correlation coefficient for two nominal variables. The coefficient is calculated by dividing the difference between the observed frequency of agreement and the frequency expected by chance by the maximum possible difference between the observed frequency and expected frequency.

Question 15

What is a person-who argument?

Accepted Answer

The answer of What is a person-who argument?...

Question 16

Imagine that you assessed the relationship between the variables of nutrition and general health.Draw the scatterplot depicting what this relationship would look like.

Accepted Answer

The answer of Imagine that you assessed the relationship between...

Question 17

What is the third variable problem and how does the partial correlation technique help with this problem?

Accepted Answer

The answer of What is the third variable problem and...

Quiz 6: Correlational Methods and Statistics

In a recent study it was found that the correlation between self-esteem and depression was ?.64.Explain what this means.Calculate the coefficient of determination for this correlation and explain what information this provides.

Suppose that the correlation between height and weight for adults is +.75.What proportion (or percent) of the variability in weight is accounted for by the relationship with height?

Pam is interested is assessing the degree of relationship between gender and test grades in her psychology class.Pam should use the _____ correlation coefficient to assess this.

Explain how curvilinear relationships can be a problem when interpreting correlation coefficients.

If a correlation coefficient that you expected to be fairly high turns out to be very low,you should investigate whether there is a

_____ is a procedure which allows us to predict an individual's score on one variable based on knowing one or more other variables.

In a recent study it was found that the correlation between self-esteem and depression was ?.64.Tom interprets this to mean that low levels of self-esteem lead to high levels of depression and vice versa.How is Tom misinterpreting these data?

The _____ is a measure of the proportion of variance in one of the variables that is accounted for by the other variable.

Two interval/ratio variables are to _ coefficient and one interval/ratio variable and one nominal variable are to _ coefficient.

Explain when each of the correlation coefficients listed below should be used.

Two nominal variables are to _ coefficient and two ordinal variables are to _ coefficient.

Assume that the regression equation for the relationship between SAT scores and IQ scores is y=9 + .105x.What would you expect the IQ score to be for the following individuals given their SAT scores?

Explain when each of the correlation coefficients listed below should be used.

If both variables are measured on a nominal scale,what type of correlation coefficient is appropriate?

What is a person-who argument?

Imagine that you assessed the relationship between the variables of nutrition and general health.Draw the scatterplot depicting what this relationship would look like.

What is the third variable problem and how does the partial correlation technique help with this problem?