ci_twosample_std(A, B, cl)

Computes a confidence interval for the ratio of two standard deviations. Samples are stored in arrays A and B, the test uses the confidence level cl.
Assumes samples are independent and populations are normal.

See also ci_twosample_pro ci_twosample_tpaired ci_twosample_tpooled 

Example

(See NOTE below)

a=(2288, 2368, 2528, 2144, 2160, 2384, 2304, 2240, 2208, 2112 )

( 2288 2368 2528 2144 2160 2384 2304 2240 2208 2112 )

b=(2592, 2512, 2576, 2176, 2304, 2384, 2432, 2112, 2288, 2752)

( 2592 2512 2576 2176 2304 2384 2432 2112 2288 2752 )

ci_twosample_std(a,b,.95)

F-Test for Two Population Standard Deviations.

Confidence interval for the ratio of standard deviations.

Confidence level : 0.95 (95%)

Results:

Interval  : (0.3202972133112341, 1.2895147603377939 )

NOTE: The data used in this example was taken from the textbook Introductory Statistics 6th Ed. by Neil A. Weiss with kind permission of Addison Wesly Longman, Inc. (AWL). AWL does not endorse nor it supports the Calcugator.