Answer:
The statement which is true is:
B. This is a double blind study
Step-by-step explanation:
- Double Blind Study is such a study method in which participants don't know about the information that can effect the participants in order to eliminate the bias. This is the case with out situation in which participants didn't know that they were the part of a study.
- Randomized Comparative Experiment is such an experiment in which participants are randomly selected for different treatments as well as the comparison of effects of different treatments is done. So, the option A is not valid in our situation.
- Observational Study is such a study in which we only observe the the data collected or participants. We observe the cause-effect relationship in this study.
- Matched Pair Design is such an experiment in which subjects are grouped in pairs. It is a special type of randomized block design.
Answer:
Step-by-step explanation:
(7*11)-(22/7*2^2)
77-(22/7*4)
77-88/7
77-12.57
64.43
11.p=-8, 17-8=9
12.y=11, 3*11=33+16=46
13.t=4, 4*4=16-14=2
14.x=9, -9x 9*8=82-9=72-9=62
15.z=4, 12*4=48-18=30
16.g=0, 4*0=0, 7+0=7
17.x=4, 9*4=36-24=-3
18.q=3, 18*3=48+2=50
19.c=2, 3*2=6-4.5=4.1
20.y=4, 9+4=13+4.8=17.4
Answer:
B. (x - 4)² + y² = 12
Step-by-step explanation:
Rewrite in standard form to find the center (h,k) and radius r.
It’s the second one
Answer: X < -3