Knewton Alta Lesson 3 Assignment 2023 Update A+

A scientist is interested in finding out the effect of soil quality on crop quality. Would an experimental or observational study design be more appropriate? Select the correct answer below: An experimental study should be used with the crop quality as the controlled factor. An observational study should be used because the soil quality cannot be controlled. An experimental study should be used with the soil quality as the controlled factor. An observational study should be used because the crop quality cannot be directly controlled. - ANS-An experimental study should be used with the soil quality as the controlled factor. A study was performed with a random sample of 513 bolts produced at one factory. What population would be appropriate for generalizing conclusions from the study, assuming the data collection methods used did not introduce biases? Select the correct answer below: The conclusions would apply to all bolts produced by that factory. The conclusions would apply to all bolts produced by any factory run by the same company. The conclusions would apply to all bolts of the same type produced by any manufacturer. The conclusions apply only to the bolts in the sample. - ANS-The conclusions would apply to all bolts produced by that factory. Since the sample is fairly large and was randomly obtained, the results should apply to the bolts made at the factory in the study. However, there could be systematic differences between that factory and any other run by the same company, so the results should not be generalized any further. A researcher wants to evaluate the effect of using Facebook on happiness. Would an experimental or observational study design be more appropriate? Select the correct answer below: An experimental study should be used with the use of Facebook as the controlled factor. Continues...