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do you mean Fe^2+ + 2e- ---> Fe (s) ? How do you make superscripts anyway???

Good point! An improvement in accuracy of the reported result is not guaranteed for the reasons you point out (calibration maybe out etc). However it does make an improvement in accuracy more likely (given that you dont know whether the calibration is faulty or not). This is what makes...

This would be true if accuracy was defned by the equipment used, but it is not. Accuracy is defined as the closeness of a result to the true-value. In this case the reported average of the water analysis would be likely to be closer to the true-value because of a larger number of samples...

Yes I agree, its definitely about which answer is more correct. Let me put the argument for answer B as incorrect this way: If I can run 100m in an average of say 13s (shown by doing the run a large number of times) then that is my ability at the moment - and it wont change by taking a sample...

Here's an example of what I'm getting at: Lets say Alice wants to analyse the pH of a sample of water with happens to have true pH value of 7.00. Alice chooses to do the analysis with a pH probe and meter. Initially Alice gets results of say 6.98,7.01, 7.02 etc. As she monitors the...

Exactly! Reliability, by the BOS definition is the "reproducibility" - or the ability of the experiment (equipment, method and operator) to produce results which are similar (close or clustered) and can be quantified by measurements of "standard deviation" and "range" done on a very large...

Thanks All, I guess from reading these posts there are many interpretation of reliability and "similarity of results" that we all have and I guess Im really after a reason for why the following argument could not be made: Suppose a student were to interpret the BOS definition of first hand...

Surely the reported result (calculated average) of the experiment should be more likely to be accurate if it is based on more measurements ??

Fair enough, However you seem to be applying a different definition to that stated by the BOS for first-hand investigations. You are using the general meaning of "dependability or credibility of the information" in the way it is used to assess 2nd hand sources. If this definition is applied...

Anyone notice a possible mistake in Q12 of multiple choice? "12) A student performed a sampling technique as part of a first-hand investigation on water quality and repeated the sampling technique several times. What aspect of the experiment was improved by repeating the procedure?" The...

Anyone notice a possible mistake in Q12 of multiple choice? "12) A student performed a sampling technique as part of a first-hand investigation on water quality and repeated the sampling technique several times. What aspect of the experiment was improved by repeating the procedure?" The...