RSCH 8210 Walden University Wk 4 Confidence Intervals Discussion

Using SPSS:

1. Take a random sample of 100.
2. Calculate the 95% confidence interval for the variable.
3. Calculate a 90% confidence interval.
4. Take another random sample of 400.
5. Calculate the 95% confidence interval for the variable.
6. Calculate a 90% confidence interval.

Post your results and an explanation of how different levels of confidence and sample size affect the width of the confidence interval. Next, consider the statement, “Confidence intervals are underutilized” and explain what the implications might be of using or not using confidence intervals. Provide examples based on the results of your data. Also, use your research to support your findings.

Be sure to support your Main Post and Response Post with reference to the week’s Learning Resources and other scholarly evidence in APA Style.

Format for Initial Post

For the random sample of 100:

• Report on the 95% confidence interval for the variable.
• Report on the 90% confidence interval

For the random sample of 400:

• Report on the 95% confidence interval for the variable.
• Report on the 90% confidence interval

Explain how different levels of confidence and sample size affect the width of the confidence interval based on you results

Explain how different levels of confidence and sample size affect the width of the confidence interval based on the statement “Confidence intervals are underutilized”

Provide examples based on the results of your data. Support your findings here with citations from the literature.

Be sure to support your Main Post and Response Post with reference to the week’s Learning Resources and other scholarly evidence in APA Style.