Help Save Dr. El-Saidi collected data on the number of hours spent by his 100 students over the weekend to prepare for Monday's Business Statistics exam. H processed the data by Excel and the following incomplete output is available. Mean 15 Sample Variance 7.20 Skewness 1.03 The median is most likely to be Multiple Choice about 15 hours less than 15 hours greater than 15 hours Cannot be determined from the information provided
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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