Zone Of Inhibition Experiment

The graph was interesting as the results were not expected. Morning fresh which costs the most was expected to have the largest zone of inhibition but this was not the case. Palmolive has the largest zone of inhibition having an 0.8 cm larger diameter then morning fresh had. It was expected that ultra would have the smallest zone of inhibition as it was the cheapest.

The sponges results were also interesting as there was no clearly seen zone of inhibitions that were noticeable enough to be able to measure. Discussion
The results that were gained from this experiment refute the hypothesis. It refute the hypothesis as the most expensive detergent (morning fresh) did not have the largest zone of inhibition. Evaluate interesting aspects of
Having our sample size made it impossible to compare it to anything other than the positive and negative controls. Increasing the sample size would have made our result more reliable as we would of had an average and errors would be easier to spot.

Another weakness within our methodology was the sponge bacteria we used. It is believed the sponges bacteria consistency was too watery and in which the water diluted the bacteria. Random errors in experimental measurements are caused by unknown and unpredictable changes in the experiment. Random errors affect the reliability of the data but not the overall outcome of the experiment.· · A random error that occured in the experiment is that only one side of the zone of inhibition was measured to find out the radius. This has an affect on the results as the circles were not perfectly round and there would have been a different radius the whole way round. A way this random error could be improved is by measuring at least 4 or more different places around the zone of inhibition. Measuring four of more points would have allowed an average to be taken and used instead of just using one points