Final answer:
The usability of data with errors depends on the errors' nature and impact on the experiment's results. Experiments can indeed make cause-and-effect claims despite potential problems. Whether an error affects the measurement of displacement depends on the error's relevance to that measurement.
Step-by-step explanation:
Whether Jim and Francesca can still use the data if they find errors depends on the nature of the errors and the context of the experiment. In scientific research, finding errors is not uncommon, and some errors can be corrected or accounted for in the analysis. For example, if a procedural error is identified, and it does not significantly impact the results, the researchers may adjust their procedure and continue with the experiment. However, if the error affects the data integrity to such an extent that the conclusions cannot be reliably drawn, the data may not be usable.
For the question about experiments and cause-and-effect claims, it is true that experiments allow scientists to make such claims, though they may encounter problems that could compromise their results. Similarly, in the second statement about displacement, if someone doesn't follow directions correctly, it's possible that the displacement measured would be incorrect. Hence, the statement that the displacement will be the same is likely false, unless the specific error made had no effect on that particular measurement, which is generally unlikely in precise scientific experiments.