Explanation: Sarah would not get a valid or accurate result or measurement due to the fact that she is using a 'faulty' yardstick in taking her measurement as the original measurement of the stick sukd be 36 inches in length, However, her measurement is being made with a 40 inches stick. This results in a deviation of 4 yards, thus probably leading to an invalid or inaccurate measurement. However, her readings are still reliable as the deviation in the measuring instrument isn't so large to result in unreliability of her recording.
