# Shared Flashcard Set

## Details

S9.4 - Confidence Intervals, Population Standard Deviation
Confidence Intervals for a Population Standard Deviation
9
Mathematics
11/08/2013

## Additional Mathematics Flashcards

Term
 Chi-square distribution, X^2 =
Definition
 (n-1)s^2/sigma^2n - 1 degrees of freedom
Term
 1. Characteristics of the chi-square distribution
Definition
 It is not symmetric
Term
 2. Characteristics of the chi-square distribution
Definition
 The shape of the chi-square distribution depends on the degrees of freedom
Term
 3. Characteristics of the chi-square distribution
Definition
 As the number of degrees of freedom increases, the chi-square distribution becomes more nearly symmetric
Term
 4. Characteristics of the chi-square distribution
Definition
 The values of X^2 are non-negative (>=0)
Term
 S^2 is
Definition
 The best point estimate of the population variance sigma^2
Term
 Lower bound
Definition
 [(n-1)s^2]/X^2(alpha/2)
Term
 Upper bound
Definition
 [(n-1)s^2]/X^2(1-alpha/2)
Term
 Which method to use?
Definition
 Page 503
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