The following datawere collected in an experiment designed to investigate the impactof different positions of the mother during ultrasound on fetalheart rate. Fetal heart rate is measured by ultrasound in beats perminute. The study includes 20 women who are assigned to oneposition and have the fetal heart rate measured in that position.Each woman is between 28-32 weeks gestation. The data are shownbelow.
Back | Side | Sitting | Standing |
140 | 141 | 144 | 147 |
144 | 143 | 145 | 145 |
146 | 145 | 147 | 148 |
141 | 144 | 148 | 149 |
139 | 136 | 144 | 145 |
Mean = 142.0 | Mean = 141.8 | Mean = 145.6 | Mean =146.8 |
Is there a significantdifference in mean fetal heart rates by position? Run the test at a5% level of significance.
