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January 30, 2015

January 30, 2015

Posted by **tracy** on Sunday, June 23, 2013 at 12:03am.

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.)

(c) Calculate sx and sy. (Give your answers correct to three decimal places.)

sx =

sy =

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

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

- statistics -
**MathMate**, Sunday, June 23, 2013 at 6:03amWhat did you get using the given formulas 13.2 and 13.3?

- statistics -
**tracy**, Sunday, June 23, 2013 at 1:03pmthis is what I done and it was wrong mean of x = 2.6 sd = 2.01108, y mean 3.9, sd 2.42441; then I added the sd 4.43549/(2.011080)(2.42441) = 5.3471

c. I just added all the x together = 26

sy = 39 The formula for 13.2 is r=covar(xto the 1power and y to 1power)= covar (x,y)/Sx X Sy

13.3 formula is ss(xy)/ sqrt ss(x)*ss(y) and that I got 127/sqrt 26*205which I had for the y squared

and that I got 190.5 which was wrong.

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