Introduction to Quantitative Measurements Issues and Techniques - PDF document

Introduction to Quantitative Measurements Issues and Techniques

What is a Quantitative Measurement? A record of data in the form of numbers. Example: – Let’ s say a technician wants to find the temperature of a vat of hot water. – He uses four types of thermometers and he receives the following data.

Quantitative Example Thermometer Temperatures 1 20.5 Celsius 2 21.00 Celsius 3 19.05 Celsius 4 18.95 Celsius

How do we evaluate the data? Reliability Variability Validity

Reliability The 1998 Honda Accord shown above is one of the most reliable cars in the world, but its reliability is dependent on its owner. The owner must take good care of the car in order for the car to serve him/her well. Chemistry instruments are similar to the Honda Accord in that although they are extremely reliable, their reliability is also dependent on how well they are cleaned and taken care of by the experimenter.