use the degrees of freedom for the mean is N and for the variance it is N-1 b.because these denominators provde the most unbiassed estimates of Micro and small alpha respectively. c.because the mean is the center of X and the variance is the average deviation from center d. because all X values ar
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
Why is N the denominator of the formula for the sample
a. because the degrees of freedom for the mean is N and for the variance it is N-1
b.because these denominators provde the most unbiassed estimates of Micro and small alpha respectively.
c.because the mean is the center of X and the variance is the average deviation from center
d. because all X values are used for computing the mean but one of the values of X is not used in computing variance
The formula for the sample variance is:
The sum of the deviations from the mean is always equal to zero because the sum of the deviations below the mean will always equal the sum of the deviations above the mean.
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