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

12.5 feet

step-by-step explanation:

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form