STATISTICS! A teacher believes that her students write longer essay responses when they type versus when they handwrite. She decided to compare the number of words students write in a typed response to the number of words they write in a comparable handwritten response to test her claim.
Which of the following best describes the effect of students typing instead of handwriting their responses, given a significance level of 0.05?

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is symmetric about the line y = 120,000.

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it is c, trust i got your back lol

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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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