Use the given information to find the number of degrees of freedom, the critical values chi Subscript Upper L Superscript 2 and chi Subscript Upper R Superscript 2, and the confidence interval estimate of sigma. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.
Platelet Counts of Women 80% confidence; nequals21, sequals65.4.
dfequals
20 (Type a whole number.)
Part 2
chi Subscript Upper L Superscript 2equals
enter your response here
(Round to three decimal places as needed.)
Part 3
chi Subscript Upper R Superscript 2equals
enter your response here
(Round to three decimal places as needed.)
Part 4
The confidence interval estimate of sigma is
enter your response hereless thansigmaless than
enter your response here.
(Round to one decimal place as needed.)
