Answer :
To improve the validity of Rajesh's experiment on the effect of fertilizer on plant growth, consider the following steps:
1. Measure the growth of a plant that did not receive fertilizer:
- It's essential to have a control group in any scientific experiment. In this case, measuring the growth of a plant that did not receive any fertilizer will provide a baseline to compare the effect of fertilizer. This helps in determining whether the observed changes in plant growth are due to the fertilizer or other environmental variables.
2. Perform additional trials:
- Conducting additional trials enhances the reliability and accuracy of the experiment. Repeating the experiment multiple times helps to account for random errors and variations. It ensures that the results are consistent and not due to outliers or any specific conditions in a single trial.
These two improvements will enhance the experimental design and the robustness of the conclusions derived from Rajesh's data.
1. Measure the growth of a plant that did not receive fertilizer:
- It's essential to have a control group in any scientific experiment. In this case, measuring the growth of a plant that did not receive any fertilizer will provide a baseline to compare the effect of fertilizer. This helps in determining whether the observed changes in plant growth are due to the fertilizer or other environmental variables.
2. Perform additional trials:
- Conducting additional trials enhances the reliability and accuracy of the experiment. Repeating the experiment multiple times helps to account for random errors and variations. It ensures that the results are consistent and not due to outliers or any specific conditions in a single trial.
These two improvements will enhance the experimental design and the robustness of the conclusions derived from Rajesh's data.