Returns the confidence interval for kurtosis.
Parameters: | sig : float
upper_bound : float
lower_bound : float
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Returns: | Interval : tuple
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Notes
For small n, upper_bound and lower_bound may have to be provided by the user. Consider using test_kurt to find values close to the desired significance level.
If function returns f(a) and f(b) must have different signs, consider expanding the bounds.