Simple ....
we know to find slope is (y1-y2)/(x1-x2)
if we plug in what we know......
(-8,-6),(2,-3)
(-6--3)/(-8-2)
it turns into...
(-6++3)/(-8+-2)
(-3)/(-10)= 3/10
Thus, your answer is that she made no mistake. (C)
Answer:

Step-by-step explanation:
Give data:






for 95% confidence interval

from standard z- table
confidence interval for P_1 and P_2 is



confidence interval is

