please explain to me why the correct answers are correct.

A political party sends a mail survey to 1500 randomly selected registered voters in a community. The survey asks respondents to give an opinion about the job performance of the current president. Of the 1500 surveys sent out, 480 are returned, and of these, only 120 show that the respondent is not satisfied with the president'sjob performance. The percentage in the sample that approve of the current president is Hide answer choices A o Incorrect: a parameter @ a Statistic Correct answer A botanist would like to know the average height of all trees on HPU property, She takes a sample of 10 trees on HPU property, and will use the average of these 10 trees to estimate the average height of all trees. The average height of these 10 trees she sampled is a Hide answer choices A o Incorrect: parameter statistic Correct answer Which graphical display would be best for simultaneously comparing the gas prices in New York, Chicago, and Los Angeles? Hide answer choices ~ A boxplot Correct answer B pie chart Incorrect: histogram D bar graph E scatterplot