Type the correct answer in each box. Spell all words correctly, and use numerals instead of words for numbers. If necessary, use / for the fraction bar(s). The scatter plot presents Ray's monthly electricity bills and the amount of time Ray spent at home from January through August.

Using the scatter plot, find the correlation coefficient of this data set.

The correlation coefficient (r) is

.

The correlation coefficient can be improved by ignoring the bill for the month of

.

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west

the answer is c.

perimeters = 3√10/5

areas = 90/25

i got it down chief.