Y = 9x means each box of the new brand is $9.
<span>So the old brand is $2 per box more. I know you </span>
<span>can do part B now!
Hope that helps!!!!!!!!!</span>
Answer:
Step-by-step explanation:
Hello!
An observational study is one where the investigator has no control or intervenes on it. He just defines the variable of interest and merely collects and documents the information.
An experimental study or experiment is one where the investigator intervenes by defining the variable of interest and artificially manipulates the study factor. It is also one of its characteristics the randomization of cases or subjects in groups (two or more, depending on what is the hypothesis of study).
1)
In the first example, the researcher doesn't control anything about the experiment, he just asks the professional musicians their age.
This is an observational study.
2)
In this second example, there is also no intervention of the researcher, she just asks her employees where they eat their lunch. This example is also an observational study.
I hope you have a SUPER day!
Hope this helps have a nice day:)
Answer:
9x+5y-5z
Step-by-step explanation:
if you need an explanation I can put it in the comments :)
