When handling chemicals during lab it is important to proceed with caution. Wear gloves whenever pouring chemicals or handling them. If there is a spill be sure to let the teacher know. If you have to dispose of chemicals, always use the waste containers provided on your lab tables.
11 âUnsystematicâ Threats to Reliability 4. Instrument reliabilityâthe research instrument or measurement approach itself (e.g., poorly worded questions, quirk in mechanical device)5. Data processing reliabilityâmanner in which data are handled (e.g., miscoding).
â¢ As such, it must meet the requirements of any good instrument: â Validityâ Reliabilityâ Accuracy Validity â¢ Validity is the extent to which a test measures what it is intended to measure. â¢ Many ways of assessing validity exist.