Answer:
Step-by-step explanation:
1. This paragraph describes an observational study.
It is not a controlled experiment because the guidance counselors didn't plan to separate the students into 2 groups and then observe the results. They instead checked records.
2. The students who took Latin are the treatment group.
3. The fact that students decided on their own to take Latin is a confounding factor.
4. The students who did not take Latin are the placebo or control group.
P(5,2) = 5!/3! = 20
in 20 ways you can give medals
The number of permutations of the 4 different letters, taken two at a time, is given by:
Answer:
$15
Step-by-step explanation:
60x75%
60x0.75
45
60-45=15
Answer:
c
Step-by-step explanation:
it is non real if x²-36<0
x²<36
|x|<6
so -6<x<6
