Confidence Interval Calculator

BySubhro Posted onApril 10, 2021September 3, 2022 Last Updated:September 3, 2022

Confidence Interval for the population means when the standard deviation is known. Confidence level, usually written as 100%, on the interval estimate…

Confidence Interval for the population means when the standard deviation is known.

Confidence level, usually written as $(1-\alpha)$ 100%, on the interval estimate of a population parameter is the probability that the interval estimate will contain the true population parameter. When $/apha=0.05,95% is the confidence level and 0.95 is the probability that the interval estimate will have the population parameter.$

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Value of z for different values of $\alpha$
Confidence Interval	$\alpha$	z
80%	0.200	1.282
85%	0.150	1.440
90%	0.100	1.645
95%	0.050	1.960
99%	0.010	2.576
99.5%	0.005	2.807
99.9%	0.009	3.291

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Subhro

Subhro Kar is an Analyst with over five years of experience. As a programmer specializing in SAS (Statistical Analysis System), Subhro also offers tutorials and guides on how to approach the coding language. His website, 9to5sas, offers students and new programmers useful easy-to-grasp resources to help them understand the fundamentals of SAS. Through this website, he shares his passion for programming while giving back to up-and-coming programmers in the field. Subhro’s mission is to offer quality tips, tricks, and lessons that give SAS beginners the skills they need to succeed.