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Class 11 Economics (Statistics For Economics) Chapter 7 Correlation Quiz 2 (25 MCQs)

Quiz Instructions

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1. If the correlation coefficient, r, of a data set is r =-0.95. What type of correlation does the data have?

Correct Answer: B) Strong negative.

2. Calculate the correlation coefficient for this data set and round to 3 places after the decimal.(5, 24), (8, 18), (13, 16)

Correct Answer: A) $-.911$.

3. The correlation coefficient, r, is given for several different linear models for a data set. Which value for r indicates the weakest best fit for the data?

Correct Answer: A) 0.01.

4. What does the correlation coefficient represent?

Correct Answer: A) The strength and direction of the relationship between variables.

5. ANOVA testing is used for .....

Correct Answer: C) Test for three or more means.

6. The correlation of the following pairs of variables can be calculated using the Pearson's sample correlation coefficient except for one. Which of the following is not included?

Correct Answer: C) Age and gender.

7. How many independent and dependent variables are there in a One-Way Within Groups ANOVA?

Correct Answer: A) 1 independent variable and 1 dependent variable.

8. What is correlation?

Correct Answer: C) The relationship between two or more variables.

9. Select all the values for r that indicate no relationship in scatter plot.

Correct Answer: E) 0.

10. A study compared the number of years of education and a person's annual salary. The correlation coefficient of the data was r = 0.913. Which conclusion can be made using the correlation coefficient?

Correct Answer: A) There is a strong positive correlation.

11. Number of pets a person has and number of books a person has read

Correct Answer: C) No Correlation.

12. In order to graphically represent a correlation between two variables researchers construct a .....

Correct Answer: D) Scatterplot.

13. What is the placebo effect?

Correct Answer: C) People's expectations or beliefs influencing or determining their experience.

14. If the correlation coefficient of a table of data is 0.85, what is true about the line of best fit?

Correct Answer: B) There is a strong, positive relationship.

15. Which is the best description of the y-intercept for the linear regression equation of the rats:Weight = 100 + 40(Time)?

Correct Answer: A) The y-intercept is 100, which means the rat is predicted to weigh 100 grams at birth.

16. If the correlation coefficient, r, of a data set is r = 0. 32. What type of correlation does the data have?

Correct Answer: C) Weak Postive.

17. Which situation best shows causation?

Correct Answer: B) The amount of time a cell phone is used affects the charge of its battery.

18. Which of the following values of r shows the strongest correlation?

Correct Answer: C) -0.57.

19. Distance traveled vs. amount of gas in the car

Correct Answer: B) Negative Correlation.

20. Data is analyzed comparing hours studied and grades. It is determined that the correlation coefficient is 0.92. This means there is a (a) between studying and grades.

Correct Answer: A) A. strong positive correlation.

21. Scale of x and y matters.

Correct Answer: B) False.

22. What would the correlation be between math grades and the time it takes to run a mile?

Correct Answer: C) No Correlation.

23. Correlation coefficient is represented by "R" .

Correct Answer: B) False.

24. DESCRIBE THE LIKELY CORRELATION BETWEEN NUMBER OF PAGES IN BOOK ANDLENGTH OF TIME REQUIRED TO READ BOOK

Correct Answer: A) POSITIVE.

25. What does a positive correlation indicate?

Correct Answer: A) Both sets of data values increase together.

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