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.
Singing voles are active day or night, and dig their own burrows or may inhabit those created by ground squirrels. In the autumn, singing voles construct forage piles between 1 quart and 8 gallons in volume. Common (Masked) Shrew (Sorex cinereus) All shrews have short legs, a long, pointed snout and long whiskers.