Correlational studies are a type of research often used in psychology as a preliminary way to gather information about a topic or in situations where performing an experiment is not possible.
The correlational method involves looking at relationships between two or more variables. While researchers can use correlations to see if a relationship exists, the variables themselves are not under the control of the researchers.
Another important thing to note is that while correlational research can reveal if a relationship exists between variables, this kind of research cannot prove that changes to one variable lead to changes to another variable. In other words, correlational studies cannot prove cause-and-effect relationships.
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Solve the application problem. Estimate the APR, and round rates to the nearest tenth of a percent.
Aluminum Cans Inc. purchased a new machine to press aluminum into cans and financed $385,000 over 30 months. The finance charge was$54,411. (a) Estimate the APR, then (b) find the exact APR using the table.
Various interventions are available for nurses to help relieve patients' pain (e.g., heat/cold applications, breathing exercises, and massage). The journal Research in Nursing & Health (Vol. 35, 2012) demonstrated the utility of statistical process control in determining the effectiveness of pain intervention. The researchers suggested the following illustration. Pain levels (measured on a 100-point scale) were recorded for a sample of 10 intensive care unit (ICU) patients 24 hours post-surgery each week for 20 consecutive weeks. The following table provides the means and ranges for each of the 20 weeks. To establish that the pain management process is "in control," an -chart is constructed.
d. Plot the means for the 20 weeks on the -chart. Is the pain management process "in control"?