The homecoming dance committee plans to conduct a survey to determine
the student body's opinion on a theme for the dance. Which sampling method
would be most likely to result in nonresponse bias?
O
A. Entering a second-period math class and surveying all the
students in that class
O
B. Standing at the school entrance and surveying every 5th student
that walks in
O
C. Handing a survey to all the students who attended the previous
year's homecoming dance
O
D. Emailing a survey to all students, but only freshman girls resbond

5

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.