The data in below table lists country code and the order to remittance (OTR) time for hardware / software installations for ...

     The data in below   table lists country code and the order to remittance (OTR) time for hardware   / software installations for the last 76 installations (from first to last).   OTR is the time it takes from an order being placed until the system is   installed and we receive payment (remittance). Because this company does   business internationally, it also notes the country of installation using a   country code. This code is listed in the first column.      Use the data in table above and answer   the following questions in the space provided below:   1.  Does the OTR time appear to   be stable?  Why or why not?   2.  If you were to use a   control chart to evaluate stability, which chart would you use?  Why?   3.  What can you learn about   the distribution of the installation process?    4.  Does it appear that the   country has an impact on installation time? Why or why not?    

     Country   Code Cycle Time   1 20   1 24   1 46   1 26   1 15   1 15   1 31   1 31   1 32   1 15   1 89   1 36   1 33   1 21   1 22   1 50   1 81   1 28   1 34   1 34   1 52   1 19   1 44   1 33   1 19   5 29   5 44   5 9   5 5   5 29   5 24   5 129   5 21   6 64   6 26   6 47   6 27   6 27   6 40   6 79   6 32   7 11   7 14   7 41   7 18   7 42   7 44   7 157   7 53   7 26   7 50   7 29   7 61   7 88   7 7   7 53   7 53   7 48   8 43   8 28   8 47   8 19   8 42   8 46   14 38   14 150   14 24   14 42   14 42   17 23   17 41   17 21   17 23   17 13   17 41   17 43