Explain why the slope b of the least-squares line always has the same sign (positive or negative) as the sample correlation coefficient r. Choose the correct relationship between b and r, where sx and sy are the standard deviations of the x values and the y values, respectively. a. b = 1/r(sx/sy)
b. b = r(sy/sx)
c. b = 1/r(sy/sx)
d. b = r(sx/sy)

Do social recommendations increase ad effectiveness? a study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. the results are given below. correctly recalled the brandarrival 409153browsing20484b. conduct the hypothesis test, using the 0.025 level of significance. what is the value of the test statistic? χ2stat=what is the p-value? p-value=is this value significant atα=0.025?

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Acylinder with a base diameter of x units has a volume of jxcubic units which statements about the cylinder are true? check all that apply. the radius of the cylinder is 2 x units. the radius of the cylinder is 2x units. the area of the cylinder's base is 200 square units. the area of the cylinder's base is a square units. the height of the cylinder is 2x units. the height of the cylinder is 4x units. mark this and return save and exit next submit