Q1) Following probability distribution has been assessed for number of accidents which occur in Midwestern city each day:
|
Accidents
|
Probability
|
|
0
|
0.25
|
|
1
|
0.20
|
|
2
|
0.30
|
|
3
|
0.15
|
|
4
|
0.10
|
Based on this distribution, expected number of accidents in given day is:
a) 0.30.
b) 1.65.
c) 2.00.
d) 2.50
Q2) Impact on sampling of increasing sample size is:
a) The potential for extreme sampling error is reduced.
b) The amount of sampling error is always reduced.
c) The sample mean will always be closer to population mean.
d) There is no specific relationship between sample size and sampling error.