Cross Validated is a question and answer site for people interested in statistics, machine learning, data analysis, data mining, and data visualization. 95th percentile of one-tailed distribution is the distance in standard deviations from the mean to the point in either one end of the axis that separates the values in one region (1 tail) having total probability of 5% and the remainder with 95%. Not the answer you're looking for?Browse other questions tagged confidence-interval standard-error ab-test confidence or ask your own question. How do I calculate required Sample Size to get useful confidence interval length for Bernoulli random variables?

Completely understanding the Confidence Interval - how is it not a probability of containing a population parameter? A study of teenagers found the following information on length of time (in minutes) each talked on phone. A redesign of the layout took place, we'll be adding more than 100 solved statistics problems.
You can find it (actually 1.645 in the table) in the table above in the bottom row and the column labeled (at the bottom) 90%.

For a two-tailed version that same distance (1.645) would result in two same regions at both ends of the axis, summing to 10% and leaving 90% in the middle.

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