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Width Of Confidence Interval. The greater the confidence level the wider the confidence interval. Click here to download or print the Study Guide for this section and use it to take notes as you follow along with the videos in this section. This chapter deals with issues of precision and the resulting CIs associated with treatment effects on dichotomous yesno outcomes such as death stroke or myocardial infarction. Explain why there a 95 chance that this interval 46 52 will contain the population proportion isnt a correct interpretation of a confidence interval.
Describe at least two ways to make a confidence interval wider. A confidence interval in short CI is a type of interval estimate of a population parameter. 806 Factors Affecting the Width of a Confidence Interval. We can examine this question by using the formula for the confidence interval and seeing what would happen should one of the elements of the formula be allowed to vary. As the sample standard deviation decreases the width of the interval decreases. The confidence interval the sample size and the sample proportion hat p.
If we assume the confidence level is fixed the only way to obtain more precise population estimates is to minimize sampling error.
Dont use plagiarized sources. The greater the confidence level the wider the confidence interval. This chapter deals with issues of precision and the resulting CIs associated with treatment effects on dichotomous yesno outcomes such as death stroke or myocardial infarction. Sample size standard deviation and the confidence level are the three major things that affect the confidence interval width. Online Private Tutoring at httpandreigalanchuknlFollow me on Facebook. 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.