Question

Consider the following bivariate data.

Point A B C D E F G H I J
x 3 4 2 1 7 2 1 0 4 2
y 1 7 3 3 6 6 5 0 6 2


(b) Calculate the covariance. (Give your answer correct to two decimal places.)
5.35 was my answer .

(c) Calculate sx and sy. (Give your answers correct to three decimal places.)
sx = 26 was my answer.
sy = 39 was my answer .

(d) Calculate r using formula 13.2. (Give your answer correct to two decimal places.)
5.35 was my answer .

(e) Calculate r using formula 13.3. (Give your answer correct to two decimal places.)
190.5 .

Answer 1

xi


8


10


12


6


4

yi


2


4


6


8


10



What is the estimated regression equation for x and y?
y-hat = 10.8 - 0.6x
y-hat = 11.6 - 0.6x
y-hat = 10.8 + 0.6x
y-hat = 11.6 + 0.6x

Answer 2

y-hat = 10.8 - 0.6x

Answer 3

y-hat = 11.6 + 0.6x