The shape of the histogram (below) for the iPad 5 run time hours is approximately Is this what you decided in part f? If the data set is bell shaped; we can use the rule to determine the percentage of iPad 5's that will run between t one S.D. from the mean. What is that percentage for all sets of bell shaped data? Finally, looking at the histogram below determine how many iPad 5's ran 3 hours before needing to be recharged? How many ran less than 3.5 hours? Start counting just to the left of 3.6...
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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