The centre of the sampling distribution of proportions for a binary variable is:

The sampling distribution of the mean is the distribution we would obtain if we took all possible samples of size n from the population and computed the corresponding sample means and looked at their distribution.

If a result is statistically significant it will necessarily be business significant.

Statistical inference draws conclusions about a sample based on the data of the population.

The possibility of doing statistical inference highly depends on how representative the sample is of the population under study.