Title: What will reduce the width of a confidence interval?
Headings: What will reduce the width of a confidence interval?
Asked by: Yoandra Velikorechanin
What will reduce the width of a confidence interval?

Content: A 95% confidence interval is often interpreted as indicating a range within which we can be 95% certain that the true effect lies. Besides, what 3 elements can influence the width of a confidence interval? The width of a confidence interval is affected by 3 measures: the value of the multiplier t* (which is driven by both the confidence level and the sample size), the standard deviation s of the original data, and the sample size n used for the data collection. Is a smaller confidence interval better? Apparently a narrow confidence interval implies that there is a smaller chance of obtaining an observation within that interval, therefore, our accuracy is higher. Also a 95% confidence interval is narrower than a 99% confidence interval which is wider. The 99% confidence interval is more accurate than the 95%.