Find two methods of estimating sigma if sigma is unknown
When determining the sample size needed to achieve a particular error estimate you need to know sigma. What are two methods of estimating sigma if sigma is unknown?
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A researcher reports an F-ratio with df 3, 36 from an independent-measures research study. How many treatment conditions were compared in the study?
Response time at an online site can be modeled with an exponential distribution with a mean service of 5 minutes. John knows this and it is not sure to wait for an answer. What is the probability that for the reply to John's request.
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