If the mean of a data set is 12.3 and the standard deviation is 0, then a. all the observations are equal to 12.3 b. there must have been a mistake in the calculation, as it is not possible to have a standard deviation of 0 c. a histogram of the data set has a single peak at zero d. a histogram of the data set will be strongly skewed e. there is a large amount of variabitilty in the data set
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.
If the mean of a data set is 12.3 and the standard deviation is 0, then
a. all the observations are equal to 12.3
b. there must have been a mistake in the calculation, as it is not possible to have a standard deviation of 0
c. a histogram of the data set has a single peak at zero
d. a histogram of the data set will be strongly skewed
e. there is a large amount of variabitilty in the data set
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