1. Use the following contingency table:
A B Total
1 20 30 50
2 30 20 50
Total 50 50 100
(a) Find the expected frequency for each cell?
(b) Compute X stat square? Is it significant at alpha-0.05?
2. The following table contains the probability distribution for X=the number of traffic accidents reported each day.
X 0 1 2 3 4 5
P(X) 0.10 0.20 0.45 0.15 0.05 0.05
(a) The probability of 3 accidents is?
(b) The mean or expected value of the number of accidents is?
(c) The variance of the number of accidents is?
(d) The standard deviation of the number of accidents is?