50 points - !

(if you could at least answer one of these, i would be extremely grateful! )

1. what is the definition of correlation?
a measure of the strength of a linear relationship between two variables
b. proof that one variable causes another
c. a measure of the strength of causation of one variable on another
d. an implication of causation

2. which of the following values for r suggests that one variable causes another?
a. -0.7
b. 0
c. 0.9
d. none of the above

3. what does an r value of -0.89 suggest about two variables?
a. that an increase in the independent variable causes the dependent variable to decrease
b. that an increase in the independent variable causes the dependent variable to increase
c. as the independent variable increases, the dependent variable increases
d. as the independent variable increases, the dependent variable decreases

(if you could at least answer one of these, i would be extremely grateful! )
!

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above

Will give brainliest b. describe the function over each part of its domain. state whether it is constant, increasing, or decreasing, and state the slope over each part.