Aschool counselor tests whether the level of depression in fourth graders in a particular class of 20 students differs from that of fourth graders in general at her school. on the test, a score of 10 indicates severe depression, while a score of 0 indicates no depression. reports on past testing indicate that fourth graders at her school usually score 5 on the scale, but the variation is not known. her sample of 20 fourth graders has a mean depression score of 4.4. the counselor tests the null hypothesis that fourth graders in this class do not differ from fourth graders in general at the school in level of depression. she calculated a t score of -.20. using the .05 significance level, what decision should she make regarding the null hypothesis?

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

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step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1

28

step-by-step explanation:

because that's the answer