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Experiment or Observational Study

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A meat processing plant has processed an average of 100 tons per day for the last several years. Newer processing machines have been installed recently. The quality control manager would like to know whether this average has improved. She randomly selects 40 days from the computer database and computes the average and standard deviation of n = 40 days to be 105 tons and 8 tons, respectively. Is this an experiment or an observational study and why?

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This is an observational study.
<br>Because in this study the investigators do not manipulate the use of an intervention, but only observe product that are exposed to the intervention, and interpret the outcomes.
<br>The ...

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A meat processing plant has processed an average of 100 tons per day for the last several years. Newer processing machines have been installed recently. The quality control manager would like to know whether this average has improved. She randomly selects 40 days from the computer database and computes the average and standard deviation of n = 40 days to be 105 tons and 8 tons, respectively. Is this an experiment or an observational study and why?

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See Also This Related BrainMass Solution

Observational Study or Experiment?

Identify whether the following study is an observational study or an experiment. If its an experiment identify the control group and treatment group and discuss whether a single or double blinding is necessary. If the study is observational state whether it is a case control study and if so identify cases and controls.

A double blind drug vs. placebo study of 109 patients suffering from tinnitus demonstrated the effectiveness of ginkgo biloba extract. The ginkgo treatment improved the condition of all patients.

- Observational study, not case control
- Experiment, the treatment group is patients that received the drug and the control group is patients that received the placebo, double blind
- Experiment, the control group is patients who received the drug and the control group is patients who received nothing, double blind
- Observational study, case control, the cases are the patients that received the drug the controls are the patients who received the placebo

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