Confidence Intervals
Discussion
Required Resources
Read/review the following resources for this activity:
Textbook: Chapter 8
Lesson 6 Reading
Minimum of 1 scholarly source AND one appropriate resource such as the textbook, math video and/or math website
In your reference for this assignment, be sure to include both your text/class materials AND your outside reading(s).
Initial Post Instructions
Use the course Excel spreadsheet to construct a 90% confidence interval for proportion research
Find the average price of homes in your state (cite your source).
Gather a Sample: Record the prices for 15 randomly selected homes in your state. (Check Zillow.com or Realtor.com).
Construct the confidence interval using Excel
Use your sample to construct a 90% Confidence Interval for the “Proportion of homes that have a price ABOVE the average price of the state.”
a). Verify that the sampling distribution of this proportion can be approximated by a normal distribution. If a normal distribution cannot be used, gather more data to satisfy the requirement.
b). Enter the Confidence Level (0.90), ‘n’ (Sample Size), and ‘x’ (Number of Successes) in the Week 6 Excel Spreadsheet.
c). From the Excel Spreadsheet: Identify the point estimate p’, the critical value Zc, the Margin of Error, and the Lower and Upper Limits of the Confidence Interval. (Round all values to 2 decimal places.)
d). Provide a screenshot of the Excel spreadsheet displaying steps b) and c).
e). Explain how the Point Estimate and the Margin of Error are used to find the Lower and Upper Limits.
Interpret the Confidence Interval (2–3 Sentences)
State your Confidence Interval and explain what it means. Explain as if you were talking to someone who has not taken statistics.
Follow-up Post Instructions
Respond to at least one peer. Further the dialogue by providing more information and clarification.
Here are some suggested responses:
Construct a 95% or 99% confidence interval based on a classmate’s data. Discuss how the margin of error and width of the interval change.
Pick a specialization in healthcare (General Surgery, Labor & Delivery, Pediatrics, Social Work, etc.). Research a topic within that specialization that would involve constructing a confidence interval.
Writing Requirements
Minimum of 2 posts (1 initial & 1 follow-up)
APA format for in-text citations and list of references
Grading
This activity will be graded using the Discussion Grading Rubric. Please review the following link:
Review: Discussion Guidelines
Review the specific grading rubric by clicking on the three dots in the upper right corner.
Course Outcome
CO 8: Interpret confidence intervals for population means or proportions.
Due Dates
