Explain why the slope b of the least-squares line always has the same sign (positive or negative) as the sample correlation coef
ficient 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)
The sign of the slope Coefficient and the correlation are the same because both the slope and correlation Coefficient evaluates the changes in one variable with respect to the other . A decrease in y as x increases will result in a negative slope value and also a negative correlation Coefficient. While increase in x which results in the increase in y imvariable will result in a positive correlation Coefficient value and r value.
Answer: The probability that 3 or more of the next 5 customers will order chocolate is 30%. 3/10
Sandy conducted her own experiment to answer this question. She observed what groups of 5 customers ordered. In her experiment, 30% of the time at least 3 of the customers ordered chocolate.
