In fact, if there is no oxygen there would be no respiration and no respiration means no functionality in plants. In absence of oxygen, the roots cannot grow and take up water, and thus not able to supply the vital nutrients to plants which they need to grow and survive. That is the reason why we need to create drainage when plants are water logged because excessive water is not the problem, the problem is less than required oxygen levels.
The variance of the skewness of a random sample of size n from a normal distribution is. An approximate alternative is 6/ n, but this is inaccurate for small samples. In normal samples, has the smaller variance of the two estimators, with. where m 2 in the denominator is the (biased) sample second central moment.f the distribution is symmetric, then the mean is equal to the median, and the distribution has zero skewness. If, in addition, the distribution is unimodal, then the mean = median = mode.
The skewness for a normal distribution is zero, and any symmetric data should have a skewness near zero. Negative values for the skewness indicate data that are skewed left and positive values for the skewness indicate data that are skewed right.By skewed left, we mean that the left tail is long relative to the right tail. Similarly, skewed right means that the right tail is long relative to the left tail.kewness is a measure of symmetry, or more precisely, the lack of symmetry. A distribution, or data set, is symmetric if it looks the same to the left and right of the center point. Kurtosis is a measure of whether the data are peaked or flat relative to a normal distribution.