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WebConfidence Intervals for Unknown Mean and Known Standard Deviation For a population with unknown mean and known standard deviation , a confidence interval for the population mean, based on a simple random sample (SRS) of size n, is + z *, where z * is the upper (1-C)/2 critical value for the standard normal distribution.. Note: This interval is only exact … WebDictionary entry overview: What does unknown mean? • UNKNOWN (noun) The noun UNKNOWN has 3 senses:. 1. an unknown and unexplored region 2. anyone who does not … Web[Unknown > English] This heavy duty metal locking box I found at a thrift r/translator • Unknown>English My dad passed away when I was 2, these were his tattoos, and i’d love to know what they mean, thank you penny carlson penn state university