Statistics Confidence Intervals

Click For Summary
SUMMARY

The discussion focuses on constructing a 95% confidence interval for the support level of the N Party based on polling data from 1996. The point estimate for the N Party's support is 0.211, with a sample size of 250 and a standard error of 0.0119. The formula for the confidence interval is defined as the point estimate plus or minus the margin of error, which can be derived from the standard error. Participants emphasize the importance of understanding how to calculate the margin of error using the provided data.

PREREQUISITES
  • Understanding of confidence intervals and their significance in statistics
  • Familiarity with the concept of point estimates in polling data
  • Knowledge of standard error and its calculation
  • Basic proficiency in statistical formulas, particularly for proportions
NEXT STEPS
  • Learn how to calculate the margin of error for proportions in statistics
  • Study the application of the Z-score in confidence interval calculations
  • Explore the implications of confidence intervals in political polling analysis
  • Review statistical software tools for calculating confidence intervals, such as R or Python's SciPy library
USEFUL FOR

Statisticians, political analysts, students studying statistics, and anyone involved in polling and survey analysis will benefit from this discussion.

sjooff111
Messages
1
Reaction score
0
1. Polotical parties rely heavily upon polling to measure their supports in the electorate. Below are the results of a poll conducted in 1996 for four (i only listed the one needed) political parties.
Level Count Probability Stderr Prob
N 250 .211 .0119
-----------
Total 1193
4 levels



2. Construct and interpret a 95% confidence interval for the level of support for the N Party in 1996









I only know how to do confidence intervals when a mean ans standard deviation is given using the formula : Mean+- Z*(Sq rt(sx/n)
 
Last edited:
Physics news on Phys.org
The outline for a confidence interval for a proportion is

Point estimate +/- margin of error

You're given the point estimate, the sample size, and standard error. Look in your book to find how to find the margin of error from this information.
 

Similar threads

Questions related to sufficient statistics and confidence interval
  • · Replies 1 ·
Replies
1
Views
2K
Confidence Interval Calculation
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Correct understanding of confidence intervals....
  • · Replies 22 ·
Replies
22
Views
4K
MHB Determine the confidence interval
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Confidence interval on Standard deviation
  • · Replies 4 ·
Replies
4
Views
2K
Calculate the confidence interval (Statistics problem)
  • · Replies 1 ·
Replies
1
Views
3K
Statistical Problem in Analytical Chem
  • · Replies 2 ·
Replies
2
Views
2K
Confidence Interval and Chi-square
  • · Replies 1 ·
Replies
1
Views
14K
Undergrad Convergence of 2 sample means with 95% confidence
  • · Replies 7 ·
Replies
7
Views
2K
Conceptual Question Dealing with Confidence Intervals
  • · Replies 3 ·
Replies
3
Views
2K