Which of the following would be considered important in including in the summary of an experimental investigation. a. sizes of glassware used in the experiment b. list of all materials and equipment used in the experiment. c. names of scientists involved in the experiment. d. the number of trial completed during the experiment

Experimental investigation involves a "fair test" in which the chosen variables are manipulated, controlled and measured in order to get evidence of relation between two or more variables. Experimental investigation includes  control variables which are taken as a standard for comparison with experimental variables. It is a type of scientific inquiry which includes observation, scientific questions, hypothesis, procedure, data, graph, analysis and conclusion. The number of trials completed during the experiment would be considered important in including in the summary of an experimental investigation. As the most important criteria to judge a experimental design implemented by the scientist depends on the data generated. Only following one data and utilizing it for concluding the overall result of the experiment can be futile. For the purpose of including accurate results trials are conducted to compare number of data and including consistent results for better experimental conclusions.