Solved: Find a 99'1t confidence interval for the variance
Chapter 25, Problem 25.1.179(choose chapter or problem)
Find a 99 % confidence interval for the variance \(\sigma^{2}\), assuming normality and using the sample:
Rockwell hardness of tool bits 64.9, 64.1, 63.8, 64.0
Text Transcription:
sigma^2
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