Two new suppliers, A & B, have recently been contracted to your firm but are still under probation. Random samples of the new firms’ performance are collected and are compared against your incumbent supplier. The table below contains samples (of size five) of data collected for the past 18 days. You are tasked to analyse the data using appropriate tools, provide a comparison of all three suppliers and a recommendation of the most appropriate supplier to senior management.
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.
Two new suppliers, A & B, have recently been contracted to your firm but are still under probation. Random samples of the new firms’ performance are collected and are compared against your incumbent supplier. The table below contains samples (of size five) of data collected for the past 18 days.
You are tasked to analyse the data using appropriate tools, provide a comparison of all three suppliers and a recommendation of the most appropriate supplier to senior management.
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