It could be any fraction really. Some examples are 5/6, 7/9 or 12/24. It doesn’t really matter what the fraction ks
Option B is the answer and that because the photo below
Increasing the sample size by a factor of 4 or multiplying
it by 4 is equal to increasing the standard error by 1/2. Therefore, the
interval will be half as varied. This also works almost for population
averages as lengthy as the multiplier from the t-curve doesn't modify much when
increasing the sample size.
Answer:
A) 2.5
Step-by-step explanation:

There are 3 because 12 divided by 4 is 3.