Hello, my name is_______________________
Algebra II Group HW Stuff Friday
Look at the margin of error formula on pg. 679. Look at examples 4 & 5 on pg. 679 and 680.
Read aloud to each other and get your learn on.
1. A survey of 1874 students and staff at Rocky found that 42% loved playing the Settlers of Catan.
a) Find the margin of error for this sample.
b) Use the margin of error to find an interval that is likely to contain the true survey results.
2. Of 400 teenagers polled in a survey, 62% do not plan to stay in their community after finishing
education.
a) How many teens said they don’t plan on staying?
b) Find the margin of error for the sample.
c) Find the interval likely to contain the true population proportion.
3) In a random sample of 408 grocery store shoppers, 258 prefer one large trip a week to several
smaller ones.
a) Find the sample proportion (pg. 677)
b) Find the margin of error
c) The interval likely to contain the true population proportion.
4) A poll of 150 voters show that a candidate A is preferred by 56% of the voters while 44% prefer
the opponent, candidate B. Should candidate A be concerned? Why or why not?
5) Your history test is 40 questions long. Each question is has 4 choices. What is the probability you
score exactly a 32 OR exactly a 33?
6) The University of Michigan accepts 62% of the students who apply. If you and your ten friends
(how many total now?) apply, what is the probability EXACTLY 5 of you get in?
Hello, my name is_______________________
7) During a 10 game stretch, Larry Bird scored 32, 21, 18, 45, 38, 28, 24, 33, 51, & 44 points.
A) Find his mean score
B) Find his mode score
C) Find his median score
D) Put his data into a box and whisker plot using number line below.
0
60
E) Find the standard deviation.
F) Put an ‘x’ on the number line below for each score he recorded. Draw in one deviation from the
mean in each direction. How many of his scores fall in this range?
0
60
A survey found that 32% of people do not listen to their voicemails. These people return the missed
calls at a rate of 57%. Of the people who do listen to their voicemails, 82% return the call.
A) Draw a tree diagram for this with labels.
B) Find P( return calls)
(It happens twice!)
C) Find P( no listen & return calls)
D) Find P( listen & not return)
E) Find P( not return | listen to voicemail)
F) Find P( not listen | return calls)
G) Find P( listen | return calls)
H) Find P( math is awesome | Mr. C is your teacher)