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.
Even the common dwarf forms such as `Dwarf Alberta, `Birds Nest and `Montgomery (at right) tend to grow much larger than many of us anticipate! As a reminder, spruce are easy to identify as theyre the only evergreen that has needles held individually on the stem that are square in cross section.