Data on tipping percent for 20 restaurant tables are: 31.00 19.00 24.00 0.00 22.00 36.00 12.00 33.00 6.00 46.00 12.00 8.00 49.00 22.00 0.00 32.00 22.00 110.00 45.00 18.00 1. Calculate the mean and standard deviation for this data set. 2. Delete the observation of 110.00 and recalculate the mean and standard deviation. How do these values compare to the values from part 1? What does this suggest about using the mean and standard deviation as measures of center and variability for a data set with outliers? 3. calculate and interpret the values of the median and IQR for 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.
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