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).
Reliability is the degree to which tests scores. are consistent, dependable, and repeatable. The greater the error of the test, the lower. the reliability. Validity. Validity is the degree to which a test or. measurement accurately measures or. reflects what it purports to measure.