Can a confidence interval straddle the zero mark? [duplicate]

From the section on Significance Testing in onlinestatbook:

Whenever an effect is significant, all values in the confidence interval will be on the same side of zero (either all positive or all negative).

Why? Can’t a confidence interval be positioned both sides of the zero? Say, can’t its range be [-12; +12]?

Answer

Can’t a confidence interval be positioned both sides of the zero? Say, can’t its range be [-12; +12]?

Certainly it can.

Did you miss the stated condition “Whenever an effect is significant”?

Attribution
Source : Link , Question Author : CopperKettle , Answer Author : Glen_b

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