X + 12 = 20
x + 12 -12 = 20 -12
x = 8
Answer:
1) matched samples
2) single sample
3) independent samples
Step-by-step explanation:
1) couples were taken and their behaviors matched
2) only one sample was used
3) two different samples were used and their average compared.
The charge on each house is 8 units
C=$1.55p
Is this what you need?
Hope this helps and hope you have a great day
X = 3.916
Sorry if the image is hard to read I had to smoosh it so it would fit