A study was conducted to see which NFL quarterbacks from the modern era (1960-2010) were the most efficient. The researchers found season statistics for all quarterbacks who played in this era and then analyzed the data to see if there existed a trend between quarterback efficiency and which year they played in.

What type of study was conducted?

a. retrospective study
b. prospective study
c. blind study
d. experimental study

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

30 people weigh 160 pounds or more

is there supposed to be a diagram or a graph for this one? ?

step-by-step explanation:

the answer is c. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀