Respuesta :

The researcher could improve the sample mean. The researcher could lower the level of confidence.

How do you improve the precision of a confidence interval?

  1. Improve the sample size. Often, the most practical method to reduce the margin of error exists to improve the sample size
  2. Reduce variability. The less that your data changes, the more specifically you can calculate a population parameter
  3. Utilize a one-sided confidence interval
  4. Reduce the confidence level

For the distribution of the mean to be​ normal, the data must arrive from a normal population or the sample must be large.  The width of the confidence interval declines as the sample size increases. The width increases as the standard deviation increases. The width increases as the confidence level increases (0.5 towards 0.99999 - stronger). The investigator could reduce the level of confidence.

To learn more about confidence intervals refer to:

https://brainly.com/question/15712887

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