Tests for homogeneity of variances
Introduction Preliminary analysis Tests for homogeneity of variances Description of excel tool Hartley’s test Bartlett’s test Conclusion of the test Failure of homogeneity assumption Introduction Most of agricultural research programs are conducted essentially due to two main purposes. Explain the way plants and animals respond to changing conditions (basic research) Obtain information to solve probelms or to make recommendations (applied research) Basic research involves a series of single experiments which are carried out in sequence. Such series of experiments are analyzed when completed and due to its sequential nature combined analysis of the experimental data is seldom required. Combined estimates will be valid only if the sites on which experiments are conducted are random sample of all possible sites in the area The combined estimate will be unbiased if e...