Apsychologist was interested in the effect of hunger on psychological disturbances. the psychologist deprived half of a group of healthy volunteers of food for one day and fed the other half normally, then administered the mmpi-2 to all the participants. what was the independent variable?

In this case, the independent variable is the food given or the absence of it, since the dependent variable is the object of attention, study. As we can see in this example the other conditions in an experiment are controlled, (volunteers are presented healthy, and is everything else is assumed remains in control..  cetereis paribus).

Independent variables are modified by the researchers in order to notice changes and then validate or invalidate the thesis, that is they are putting into experimental validation this variable. This is a common feature in the scientific method.

x = 7

step-by-step explanation:

equating the expression for area to the given area

2x² - 7x - 4 = 45 ( subtract 45 from both sides )

2x² - 7x - 49 = 0 ← in standard form

to factor consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 2 × - 49 = - 98 and sum = - 7

the factors are - 14 and + 7

use these factors to split the middle term

2x² - 14x + 7x - 49 = 0 ( factor the first/second and third/fourth terms )

2x(x - 7) + 7(x - 7) = 0 ← factor out (x - 7)

(x - 7)(2x + 7) = 0

equate each factor to zero and solve for x

x - 7 = 0 ⇒ x = 7

2x + 7 = 0 ⇒ 2x = - 7 ⇒ x = -

thus the positive value for x is x = 7

answer; i believe that the correct answer is ( rivers);