Reference no: EM13242099

A study reported in the Journal of the American Medical Association investigated the cardiac demands of heavy snow shoveling. Eight healthy men underwent exercise testing with a treadmill and a cycle ergometer modified for arm cranking. The men then cleared two tracts of heavy, wet snow by using a lightweight plastic snow shovel and an electric snow thrower. Each subject's heart rate, blood pressure, oxygen uptake, and perceived exertion during snow removal were compared with the values obtained during treadmill and arm- crank ergometer testing.

Suppose the following table gives the heart rates in beats per minute for each of the eight subjects. At the .05 level of significance, test for any significant differences.

 Subject           Treadmill         (Arm-Crank Ergometer)          Snow Shoved             Snow Thrower

1                      177                  205                                                      180                              98

2                      151                  177                                                      164                              120

3                      184                  166                                                      167                              111

4                      161                  152                                                      173                              122

5                      192                  142                                                      179                              151

6                      193                  172                                                      205                              158

7                      164                  191                                                      156                              117

8                      207                  170                                                      160                              123