Two-Way Tables
        For which of the following pairs of variables would a two-way table of 
        counts be a useful data analysis tool?
        a)   age and blood pressure
        b)   age and opinion on presidential performance
        c)   party affiliation and opinion on presidential performance
        d)   diet and growth rate
        Two-Way Tables (answer)
        For which of the following pairs of variables would a two-way table of 
        counts be a useful data analysis tool?
        a)   age and blood pressure
        b)   age and opinion on presidential performance
        c)   party affiliation and opinion on presidential performance
        d)   diet and growth rate
        Two-Way Tables
        This table shows the results of a simple random sample asking 
        respondents what types of cars they drive and whether their 
        commuting distance is less than 20 miles.  What proportion of the 
        people in the sample drive less than 20 miles to work?
        a)   33 / 175 = 0.189
        b)   33 / 250 = 0.132
        c)   175 / 250 = 0.700
        d)   75 / 250 = 0.300
        e)   52 / 250 =  0.208
        Two-Way Tables (answer)
        This table shows the results of a simple random sample asking 
        respondents what types of cars they drive and whether their 
        commuting distance is less than 20 miles.  What proportion of the 
        people in the sample drive less than 20 miles to work?
        a)   33 / 175 = 0.189
        b)   33 / 250 = 0.132
        c)   175 / 250 = 0.700
        d)   75 / 250 = 0.300
        e)   52 / 250 =  0.208
        Multiple Comparisons
        What is the “problem of multiple comparisons” in statistics?
        a)   how to sort out the general meaning of a set of comparisons
        b)   how to do many comparisons with an overall measure of confidence
        c)   how to decide which of a large set of comparisons to do
        d)   how to compute a large number of comparisons efficiently