Your dog is running around the grass in your back yard. He undergoes successive displacements 3.46 m south, 7.96 m northeast, and 14.2 m west. What is the resultant displacement? (Take the +x direction to be east.)

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error