Aresearcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression. one sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin. a second sample of rats receives a drug that lowers brain levels of serotonin. then the researcher tests the animals by recording the number of aggressive responses each of the rats display. the data are as follows.
control low serotonin
n = 10 n = 15
m = 14 m = 19
ss = 180.5 ss = 130.0
a. does the drug have a significant effect on aggression? use an alpha level of .05, two
tails.
b. compute cohen

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

don't give

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try and try and you will not

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the correct answer is 1: 2

step-by-step explanation:

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2160ft3

step-by-step explanation: