When analysing normally distributed data, standard deviation can be used in conjunction with the mean in order to calculate data intervals. If = mean, S = standard deviation and x = a value in the data set, then. 1  about 68% of the data lie in the interval: . 2  about 95% of the data lie in the interval: + 2S.
Little gem arborvitae (Thuja occidentals 'Little Gem') is an evergreen shrub that keeps its brilliant color and foliage all year long. Growing 1 to 3 feet tall, little gem has medium texture and a slow growth rate. The dense dwarf shrub has a compact form and globose shape.
A dwarf cultivar, 'Conica', is popular as a garden plant. Fast Growing Trees Nursery also carries elegant dwarf Alberta spruce spiral topiaries. Dwarf varieties are designed to be smaller than the parent tree, and are often used as vertical accent specimens within the landscape.Dwarf varieties are also suitable for growing in containers. dwarf cultivar, 'Conica', is popular as a garden plant. Fast Growing Trees Nursery also carries elegant dwarf Alberta spruce spiral topiaries. Dwarf varieties are designed to be smaller than the parent tree, and are often used as vertical accent specimens within the landscape.