For the following set of scores: 1, 5, 7, 3, 4 Assume that this is apopulationof N = 5 scores and compute SS, variance and standard deviation for the population. Now assume that this is asampleof n = 5 scores and compute variance and standard deviation for the sample. Explain why the formula for sample variance dividesSSby n – 1 instead of dividing by N.
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.
- For the following set of scores: 1, 5, 7, 3, 4
- Assume that this is apopulationof N = 5 scores and compute SS, variance and standard deviation for the population.
- Now assume that this is asampleof n = 5 scores and compute variance and standard deviation for the sample.
- Explain why the formula for sample variance dividesSSby n – 1 instead of dividing by N.
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