Determine what descriptive statistic or inferential test is appropriate for each problem in this set. An experimenter is interested in the effect of expectations and drugs on alertness. Each participant is given an amphetamine (stimulant) or a placebo (an inert substance). In addition, half in each group are told that the drug taken was a stimulant and half that the drug was a depressant. An alertness score for each participant is obtained from a composite of measures that included a questionnaire and observation.

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

answer: 0.64

step-by-step explanation:

answer: y = -2.5x - 15

              (-6,0)

step-by-step explanation:

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)