Confidence Intervals & Z-Scores - University of Alberta

Confidence Intervals & Z-Scores ... How to convert between scales 𝑥 Raw data value Critical t-value -level . Z-score ... ( 𝑎𝑙 −𝑥)/s -3 -2 -1 0 31 2 Z-scores 𝑥 Raw data value Z -value • Similar to the t-distribution for large sample sizes (N≥30) • Need to know the population standard deviation is known ................
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