Q1) Give the variance of following distribution?
|
x
|
p(x)
|
|
0
|
0.20
|
|
1
|
0.35
|
|
2
|
0.10
|
|
3
|
0.25
|
|
4
|
0.10
|
i) 1.83
ii) 1.31
iii) 1.25
iv) 1.71
Q2) A researcher surveyed college students to study their opinion about proposed change in smoking rules. Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as
a) 30 students are not sufficient for a good sample
b) Students who strongly supported change and those who simply mildly supported change are counted same
c) There are 3 possible outcomes, not 2
d) Less than half of the students supported the change