1. The following probability distribution has been assessed for the number of accidents which take place 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, the expected number of accidents in a given day is:
a. 0.30.
b. 1.65.
c. 2.00.
d. 2.50
2. The impact on sampling of increasing the 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 the population mean.
d. there is no specific relationship between sample size and sampling error.