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# Descriptive Statistics and Probability.

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1 Define/discuss categorical variables vs. numerical variables.
2 Define/discuss sample vs.population.
3 Define/discuss skewness vs. kurtosis.
4 Define/discuss the three types of probability.
5 Define/discuss the types of 'events' associated with probability.

Compute the mean, median, mode, range,
standard deviation and z-scores INDIVIDUALLY.
Call Length
4.21
5.55
3.02
5.13
4.77
2.34
3.54
3.20
4.50
6.10
0.38
5.12
6.46
6.19
3.79

The time period from 2009 to 2012 saw a great deal of volatility in the value of stocks.
The data in the following table represent the total rate of return of our companies from 2009 to 2012.
Calculate the descriptive statistics for each company. Compare and discuss the results.
***You may use the 'descriptive statistics' table for this one.
Year Company A Company B Company C Company D
2012 25.3 26.4 45.4 29.4
2011 15.01 22.1 21.58 20.9
2010 5.44 11.9 1.03 10.97
2009 6.2 9.1 3.02 10.89

Consider the following contingency table; provide the
solutions for a through b.
B B'
A 10 30
A' 25 35

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