Vangel [9] proposed a new confidence interval for the coefficient of variation
which he called the modified McKay‘s confidence interval. He proposed the choice for
the function θ by 2
,
2 1
1 ν α
ν θ
ν χ
= +
+ . He also suggested that the modified McKay
method gave confidence intervals for the coefficient of variation that are closely related
to the McKay’s confidence interval but they are usually more accurate. The modified
McKay’s confidence interval for a coefficient of variation is given by