1. Provide the variance of following distribution?
|
x
|
p(x)
|
|
0
|
0.20
|
|
1
|
0.35
|
|
2
|
0.10
|
|
3
|
0.25
|
|
4
|
0.10
|
A) 1.83 B) 1.31 C) 1.25 D) 1.71
2. A researcher surveyed college students to study their opinion regarding the proposed change in smoking rules. The researcher asked the group of 30 students - 12 of them supported the change, 13 of them didn't, and 5 had no opinion. This isn't the binomial model because
A) 30 students aren't enough for good sample
B) The students who strongly supported the change and those who only mildly supported change are counted the same
C) There are three possible outcomes, not 2
D) Less than half of the students supported the change