A restaurant is interested to see how strong the correlation is between the number of table staff and the number of complaints on a given night. On the basis of historical data, it estimates the probabilities as follows: Table Staff Complaints 2 3 4 0.12 0.3 0.28 1 0.06 0.12 0.02 2 0.08 0.02 What is the mean number of table staff? O 2.94 O 3.00 O 3.04 O 3.20 O 3.88
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.
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