A variable of two populations has a mean of 9.4 and a standard deviation of 2.9 for one of the populations and a mean of 9.2 and a standard deviation of 4.5 for the other population. For independent samples of sizes 4 and 6, respectively, find the mean of x1 - x2. A) 0.02 B)-176.00 C) 6.5 D) 0.2

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guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

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