Question

1) Which linear equation BEST represents the line of best fit for the scatterplot? A) y = x B) y = 3x C) y = -3x D) y = 5x + 1 2) Which graph shows no correlation? A) A B) B C) C D) D * Hover over answer image to enlarge 3) Which of the choices is the best example of a line of best fit for the scatterplot? A) A B) B C) C D) D * Hover over answer image to enlarge 4) The graph represents the current stock market trends. The best fit line shows A) no correlation B) weak positive correlation C) weak negative correlation D) strong positive correlation 5) Describe the correlation. A) no correlation B) prime correlation C) positive correlation D) negative correlation A survey was taken asking participants their age and how many soft drinks they drink a week. The results are displayed in the scatterplot. The data for people age 15-19 are not shown. Based on the scatterplot, how many soft drinks would 15-19 year olds be expected to drink in a week? A) 4 B) 6 C) 8 D) 14 7) Person BMI Total Cholesterol 1 20 157.87 2 22 170.85 3 24 183.83 4 26 196.81 5 28 209.79 6 30 222.77 7 32 235.75 Total Cholesterol and BMI were measured several individuals. Using the regression line, what is the expected total cholesterol if a person has a BMI of 35? A) 249.45 B) 253.21 C) 255.22 D) 257.43 8) The Dudley family just brought home twins from the hospital. Their neighbor's baby was born on the same day as the twins. A reasonable conclusion is that the Dudley family will spend more money on diapers. Is this association positive, negative, or neither? Is the relationship more likely a causation or correlation? A) neither B) positive; causation C) negative; correlation D) positive; correlation 9) Which causal relationship is justifiable? A) Children with bigger feet spell better. Spelling better causes a child's feet to grow. B) Surf board sales rise when lemonade sales rise. Drinking lemonade causes more people to buy surfing boards. C) The traffic is heavier around the stadium when a game is being played. Games being played cause more traffic. D) An elementary school child has more cavities than his baby brother. He also has a larger vocabulary. An increased vocabulary causes cavities. 10) Based on this graph, which statement MUST be true? A) More x causes less y. B) More x causes more y. C) There is a negative correlation between x and y. D) There is a positive correlation between x and y.

Answer 1

Answer:

1) A. y = x + 2

Once a line of best fit has been placed upon a scatter graph it is straightforward to find the equation. The general equation of a straight line is: y = mx + c Where m is the slope (gradient) of the line and c is the y-intercept.

4) d. strong positive correlation.

The slope of the line is positive. Most points lie close to the line.  

(I am not sure if this is correct or not, I am so sorry)