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).
There are several operational definitions of inter-rater reliability in use by Examination Boards, reflecting different viewpoints about what is reliable agreement between raters. There are three operational definitions of agreement: 1. Reliable raters agree with the official rating of a performance.