What does it mean when the difference is statistically significant

it is a result that's attributed to chance, which means there really is no difference

Explanation:

the histogram that represents the data with the largest spread is data set b

answer: the mildest forms of push polling are designed merely to remind voters of a particular issue. for instance, a push poll might ask respondents to rank candidates based on their support of an issue in order to get voters thinking about that issue. many push polls are negative attacks on other candidates.