. ..... . ..... .................. ..... .... ..... ... Facebook Users End-of-year data for the number of users (in millions) of a certain social media site from 2008 through 2011 are given in the following table. Year 2008 2009 2010 2011 Number, y 140.5 332,4 645.3 856 (a) Letting x = 0 denote the end of 2008, find an equation of the least-squares line y for these data. y = 245.94x - 493722.88 (b) Use the result of part (a) to project the number of users (in millions of users) the social media site has at the end of 2017, assuming that the trend continued. million users
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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