Question 30. Consider the following scatter plot. -2 x1 The coefficient of correlation of the two variables . a) is negative. b) is positive. c) should have an absolute value greater than 0.4. d) should be close to zero. x2 -1

Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. (b) Would you say the correlation is low, moderate, or strong? positive or negative? a) moderate and positiveb) low and negative c) strong and positived) strong and negativee) low and positivef) moderate and negative As x increases, does the value of r imply that y should tend to increase or decrease? Explain. a) Given our value of r, y should tend to decrease as x increases.b) Given our value of r, y should tend to remain constant as x increases. c) Given our value of r, y should tend to increase as x increases.d) Given our value of r, we cannot draw any conclusions for the behavior of y as x increases.

Which of the following denotes the slope or the regression coefficient for X?       A) The term a       B) The term b       C) The error term       D) The correlation coefficient, r

7. The following scater plot shows the weights and lengths of some đinosaurs. Dinosaur Sizes y 70 60 30 20 10 20 40 60 80 100 Length (feet) Which statement accurately describes the information in the scater plot? A The information shows a positive correlation. The weight of a dinosaur tends to increase according to its length. B. The information shows a negative correlaion. The weight of a dinosaur tends to decrease according to its length. C. The information shows no correlaton. The weight and length vary according to the type of dinosaur. D. The information shows no correlation. The relationship between the weight and length of a dinosaur is uncertain. Weight (tons)

The correlation coefficient r = -0.95 represents a linear relationship that is...Group of answer choices weak and positive weak and negative moderate and positive moderate and negative strong and positive strong and negative

Solve.

An instructor finds that she cannot predict a student's performance on an exam based on their attendance at the review session for the exam. This relationship is best reflected in which of the following correlations. r.= +1.00 r= -1.00 r=.50 r = 0.00