Question

Q7. What is the coefficient of determination?

Q11. State which correlation coefficient (Pearson, Spearman, point-biserial, or phi) should be used given the following information.

1. Both factors are interval or ratio scale.
2. Both factors are ranked.
3. One factor is dichotomous, and the other factor is continuous.
4. Both factors are dichotomous.

Q13. State whether each of the following is an example of a positive correlation or a negative correlation.

1. Higher education level is associated with a larger annual income.
2. Increased testosterone is associated with increased aggression.
3. The smaller the class size, the more students believe they are receiving a quality education.
4. Rising prices of apples are associated with the sale of fewer apples.

Q25. Using the Pearson correlation coefficient, researchers studying the dangers of cell phone use while driving found a positive correlation between cell phone use while driving and car accidents (r = .24) in a sample of 52 participants. Using a two-tailed test at a .05 level of significance, state the decision to retain or reject the null hypothesis

Answer 1

ANSWER:

Q 7. What is the coefficient of determination:

The coefficient of determination (denoted by R²) is a value  output of regression analysis. It is interpreted as the proportion of the variance in the dependent parameter that is expected value  from the not dependent variable.

Q 11. State which correlation coefficient:

I) Both factors are interval or ratio scale:

Both factors are interval or ratio scale is used Pearson correlation coefficient.

II) Both factors are ranked:

Both factors are ranked is used Spear man.

III) One factor is dichotomous, and the other factor is continuous:

One factor is dichotomous, and the other factor is continuous is used point -biserial.

IV) Both factors are dichotomous:

Both factors are dichotomous is used Pearson.

Due to insufficient time, i will not answer Q17 and Q25 .

please separate questions , i will answer it .

Thank you !