11 seminar - suplement



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Problem 5.:

Data of 65 employees were processed and realizations of following variables are recorded in
contingency table:

X denotes the years of practical experiences and Y denotes efficiency bonus in Kč.


                      x

                                                                           y

                          1250

                              1750

                                  2250

                                      2750

                                          3250

                                              3750

                                                  4250

                      12,5

                          5

                              3

                                  0

                                      0

                                          0

                                              0

                                                  0

                      17,5

                          2

                              4

                                  4

                                      0

                                          0

                                              0

                                                  0

                      22,5

                          0

                              1

                                  6

                                      7

                                          4

                                              0

                                                  0

                      27,5

                          0

                              0

                                  1

                                      3

                                          7

                                              1

                                                  0

                      32,5

                          0

                              0

                                  0

                                      1

                                          10

                                              5

                                                  1


Calculate the realization of the sample correlation coefficient R[12 ]and interpret its value.

To save time, following sums are available:

,