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April 19, 2014

April 19, 2014

Posted by **Kimberly** on Friday, March 15, 2013 at 4:07pm.

Find the regression estimate of the weight of a chick that hatches from an egg 24 mm in diameter.

Find the regression estimate of the weight of a chick that hatches from an egg 22.5 mm in diameter.

- Statistics -
**Anonymous**, Saturday, March 16, 2013 at 5:22amno idea..

- Statistics -
**MathGuru**, Sunday, March 17, 2013 at 6:19pmEggs(x): mean = 23, sd = 0.45

Weights of chicks(y): mean = 6, sd = 0.5

Correlation: r = 0.75

Regression equation is in this format:

predicted y = a + bx

...where a = intercept and b = slope.

To find the equation, you need to substitute the information given in the problem into a workable formula:

predicted y = (rSy/Sx)X - (rSy/Sx)xbar + ybar

...where r = correlation, Sy = sd of y, Sx = sd of x, and X is the variable in 'a + bx' equation.

Note: xbar = mean of x; ybar = mean of y.

I'll let you take it from here. (Once you calculate the predicted y formula, substitute 24 and 22.5 for x in the formula to predict weights of the chicks.)

- Statistics -
**Andrea**, Sunday, March 17, 2013 at 7:44pmHow do you find the intercept?

- Statistics -
**Anonymous**, Wednesday, March 20, 2013 at 3:06pm-13.17

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