Question

sseument Part& Pretected Viei)Word Mailings Review View Help Tell me what you want to do Enable Editing ruses. Unless you need to edit, it's safer to stay in Protected View 1. Two variables have a strong negative correlation. Which of the following statements is not true? a. the dependent variable decreases as the independent variable increases b. the trend of the data exhibits an irregular decline c. the line of best fit has a negative slope d. most data points lie close to the line of best fit 2. Which of the following properties are necessary for a good line of best fit? a. it must pass through the origin b. it must pass through the median of the data c. it must have a positive slope d. it must represent the trend of the data 3. Which of the following statements accurately describes a median- median line? a. this line only passes through key points based on medians b. this line passes through the median x-value and median y-value of the data c. another name for this line is the line of best fit d. this line is used when there is no correlation between the variables 4. What type of correlation exists in the following scatter plot? a. weak positive c. weak negative b. strong d. strong negative positive ibility Mede] Word Mailings Review View Help Design Laout Tell me what you want to do : . IO: Ш ,İLNornal]TNo Spac Heading 2 Title Subtitle Subtle Em. Emphasis Paragraph Styles 5. What type of data set can be subjected to regression analysis? a. only linear b. only quadratic c. either linear or quadratic d. any type of function 6. What type of correlation would most likely exist between the amount of time spent studying for a math test and the mark achieved on the math test? a. a positive correlation b. a negative correlation c. strong correlation d. weak correlation 7. What type of correlation is indicated when two variables have a correlation coefficient of r 0.9? a. a strong positive correlation b. a weak positive correlation c. a strong negative correlation d. a weak negative correlation 8. Which of the following correlation coefficients, r, would result in a wo variables have a coefficient of determination, r2, of 0.64 a. -0.64 b. 0.41 d. 0.32 9. What is the value of the correlation coefficient, r, for a relationship in which all data values lie on the regression line? a. +1 b. 0 C. d. +1 or -1 b. 0 d. +1 or-1 Which correlation coefficient would be calculated for the regression line shown in the graph? 10. a. +095 b. 0.5 C. -0.95 d. 0 9D 8D 70 60 LD 3D 20 10 20 30 40 50 1. What do the residuals for a set of data represent? a. differences between consecutive x-values b. vertical differences between data points and the line of best fit c. data points that lie below the line of best fit d. data points that do not lie on the line of best fit If a set of data has a very strong correlation, what will be the general nature of the residuals? a. very large b. positive 12. c. negative d. very small Which of the following scenarios would likely produce a relationship with a negative correlation? 13. a. amount of studying and mark on a test b. temperature and number of kids at a pool c. a person's arm length and leg length d. number of people and slices of pizza per person Conclusions based on the following graphs are misleading. How has the information used to compare car and minivan sales been manipulated to produce a misleading message? 14. Minlvan Sales In Canada Car Sales In Canada 980 2000 1990 2000 98 Year Year a. data was taken over a short period of time b. data was generated from a small sample size c. data was presented with differing vertical scales d. data was collected from one city in each province 15. 15. What type of relationship between two variables exists when a change in the independent variable produces a change in the dependent variable? a. A cause-and-effect relationship b. A reverse cause-and-effect relationship c. An accidental relationship d. A presumed relationship Styles Font What type of variables influence the relationship between the independent variable and dependent variable? 16. a. continuous b. discrete c. extraneous d. accidental What is a statistician testing for when he or she compares the level of blood clotting factors of various subjects by test 1 (prothrombin time) to the levels of the same subjects by test 2 (S2236 thrombin assay)? 17. a. validity b. reliability c. placebo effect d. cause and effect

Answer 1

1.) A strong negative correlation means the data points lie close to the line. The slope of the line of best fit is negative and the dependent variable decreases as the independent variable increases.

So the correct answer is B.