Two students were testing the amount of fertilizer that would best promote the growth of strawberries in a garden. which of the following could be an unavoidable source of experimental error? a. length of the study b. variation in the strawberry plants c. the cost of watering the plants d. fertilization during the study

The correct answer would be option D, that is, fertilization during the study.  

The experimental error refers to the dissimilarity between a measurement and the true value or between the two measured values. Experimental error is determined by its accuracy and precision.  

A variation in data, or error, basically signifies whatever results in the data to be imperfect, not the human mistakes. In order to correct this, there is a need to get familiar with the unavoidable sources of error and how they take place so that one can reduce their effect and get the best probable data.