An article in Concrete Research presented data on compressive strength xx and intrinsic permeability yy of various concrete mixes and cures. Summary quantities are nn = 14, yyii = 572, yyii 2 = 23530, xxii = 43, xxii 2 = 157.42, and xxiiyyii = 1697.80. Assume that the two variables are related according to the simple linear regression model. a. Estimate σσ2. b. Test for significance of regression using = 0.05. Can you conclude that the model specifies a useful linear relationship between these two variables?

step-by-step explanation:

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step-by-step explanation:

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the answer is b.

step-by-step explanation:

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus