the number of degrees of freedom, Basic Statistics

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Use the given information to find the number of degrees of? freedom, the critical values chi Subscript Upper L Superscript 2?2L and chi Subscript Upper R Superscript 2?2R?, and the confidence interval estimate of sigmas. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.
Platelet Counts of Women 9090?% ?confidence; nequals=2727?, sequals=65.565.5.

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