Test statistics that follow a chi-squared distribution arise from an assumption of independent normally distributed data, which is valid in many cases due to the central limit theorem. A chi-squared test can be used to attempt rejection of the null hypothesis that the data are independent.
Voles, also known as mice, live in field, forest, and shrub habitats. Voles can cause extensive damage when they move into our turf and landscaped gardens in search of food and shelter. Voles do not hibernate and are active throughout the year. They can reproduce year round having many litters per year.
Wild ostriches live in the dry, hot savannas and woodlands of Africa. They once roamed all over Asia, Africa and the Arabian Peninsula, but because they have been hunted so extensively, wild ostriches' range has been reduced to sub-Saharan Africa, according to the University of Michigan Museum of Zoology.