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.
Voles are rodents about the size of a mouse that burrow underground. Voles have shorter tails and smaller ears and eyes than mice. Due to their similarities, they are sometimes known as meadow mice or field mice. Voles are also often mistaken for moles.