A Research Team Conducted a Critical Study,and Using the Data

question 31

Multiple Choice

A research team conducted a critical study,and using the data they gathered in their random experiment,a 95% confidence interval for the population mean was constructed.The team was not happy with the result because they felt the margin of error was much too large.All other things being equal,if they were to repeat the study,what could they do to reduce the margin of error?

• A)They could construct the confidence interval with a lower confidence level than they previously used.
• B)They could include a greater number of subjects in the experiment.
• C)They could reduce the population standard deviation  .
• D)All of the above are possible things for them to try.
• E)None of the above will work because of the randomness in the experiment.

---

Definitions:

Classification

The systematic arrangement in groups or categories according to established criteria, used across various contexts, including biology, information management, and library science.

Curling Irons

Heated tools used to create curls or waves in the hair, available in various diameters for different curl sizes.

Stoves

Appliances used for heating or cooking, which can operate on various fuels such as gas, electricity, or wood.

Clothing Irons

Electrical appliances used to remove wrinkles from fabric by applying heat and pressure.