Problem 1(b). 
As in the example done in Outline 7, once you have found the draws from the 
posterior distribution of theta1 and theta2 in part (a), you already have 
what you need for part (b). The first column is the marginal for theta1 and 
the second gives you the marginal for theta 2 (that is, column 1 is 
equivalent to draws from the marginal for theta1).  Please, read outline 7. 
We did a similar kind of thing in the section where we compute the posterior 
distribution of the LD95... 

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Problem 1(a)
Although I said in my email that I would like you not to change the names of 
functions and the names of the commands within the functions, you have to 
change the likelihood function. You have a new likelihood function and that 
needs to be typed. 

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