>>Recently one of my students asked me to help with statistics. So, we work with Kaplan AP Statistics. There I see:
>>"...decrease the margin of error by a factor of 1/4...."
>>
>>Just curious, is this passage completely understandable for those of you how was born in English language environment?
>
>Nope. Dragan has it right. Read as written, it means to multiply the margin of error by a factor of 4.
>
>Tamar

Looks like it is not the case. They want to get 1/4 of the original. See their explanation attached.