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19.Which of the hypotheses tests below are two-tailed?

1. A school administrator believes that recent TAKS test scores are above the national average.

2.  A car dealer believes that the average value of used cars has changed since the recession.

3.   A Texas state senator has taken a sample of his constituents that indicates their incomes are below the historical state average.  The senator asserts that Texas incomes have fallen. (Points : 3)

      
      
      
      

 

20.In decomposition the seasonal indices are the period relationships between what two data series? (Points : 3)

      
      
      
      

 

21.

If you have trend in a data series how can you confirm it and determine if it is statistically significant" (Points : 3)

      
      
      
      

 

 

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