Howtosignalprocessing
- What does it mean when confidence interval crosses 1?
- Can P-value be significant but confidence intervals overlap?
- Can a confidence interval that includes 1 be statistically significant?
- What is the relationship between significance level and confidence interval 1 point?
What does it mean when confidence interval crosses 1?
Confidence interval (CI)
If the confidence interval crosses 1 (e.g. 95%CI 0.9-1.1) this implies there is no difference between arms of the study.
Can P-value be significant but confidence intervals overlap?
If two confidence intervals overlap, the difference between two estimates or studies is not significant. No! The 95 % confidence intervals from two subgroups or studies may overlap substantially and yet the test for difference between them may still produce P < 0.05.
Can a confidence interval that includes 1 be statistically significant?
The situation is equivalent with the relative risk; if the confidence interval contains the relative risk of 1.00, the result is not significant.
What is the relationship between significance level and confidence interval 1 point?
The significance level defines the distance the sample mean must be from the null hypothesis to be considered statistically significant. The confidence level defines the distance for how close the confidence limits are to sample mean.
