A sample of 9 cans of Brand A diet soda gave the mean number of calories of 66.1 per can with a standard deviation of 2.4 calories. Another sample of 16 cans of Brand B diet soda gave the mean number of calories of 68.7 per can with a standard deviation of 4.5 calories. Assume that the calories per can of diet soda are normally distributed for both brands with equal standard deviations. State and test the hypothesis that Brand A has lower mean number of calories per can than Brand B at 5% significance level.
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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