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In Figure 1 are shown histograms of 6 simulated data sets. Below are the 6 distributions from which these data sets are simulated, but rearranged in a random order. Match the distribution to the histogram.

(A): Uniform on [-2,2]. Data Set 5 has values between -2 and 2 and the histogram is pretty ``flat''.
(B): Normal with mean 10 and standard deviation 2. Data Set 4 is centered roughly at 10 and has the ``bell shaped'' appearance.
(C): Normal with mean 50 and standard deviation 10. Data Set 3 is centered roughly at 10 and has the ``bell shaped'' appearance.
(D): Exponential with mean 20. Data Set 6 has the right shape for the histogram - like the exponential distribution.
(E): Gamma with parameters $\alpha = 3$ and $\beta = 1/6$ .Data Set 1 is skewed right like a Gamma distribution.
(F): None of the above. This must be Data Set 2 by a process of elimination.

**Figure 1:** Six histograms for Practice Exercise 1.
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Problems? Questions? (I may have made a mistake, so don't hestitate to ask) dcox@stat.rice.edu

Dennis Cox
3/12/2001