An experiment that can result in different
outcomes, even though it is repeated in the same
manner every time, is called a random experiment.
The set of all possible outcomes of a random
Probability of a Union
If A and B are two events, then
P A B P A P B P A B .
Mutually Exclusive Events
If A and B are mutually exclusive, then
P A B P A P B
For three events A, B, and C,
P A B P A P B P C
P A B P A C P B C P A B C .
HYPOTHESIS TESTING: TWO SAMPLE TESTS
9.1 Hypothesis Testing on the differences
RECALL THE PROCEDURE
State null hypothesis, H0
State alternative hypothesis, H1 or Ha
Decide on level of significance, .
UK1 BOCHEMICAL OXYGEN DEMAND (BOD)
The biochemical oxygen demand (BOD) determination is an empirical test in which
standardized laboratory procedures are used to determine the relative oxygen requirements of
wastewater, effluents, and pol