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Using Proportions
Random or Not?
Critical Thinking
Vocabulary
Spiral Review
100
Mazarion randomly surveyed 10 students on their favorite color.  Two students prefer green.  How many students prefer green if he asks 20 students their favorite color?
4 students
100
Mrs. Berzanskis chose 5 students to answer a survey about math class by picking 5 names out of a hat.
Random
100
I asked every 5th students that walks in my classroom if they prefer horror movies or comedy movies.  What type of random sample is this?
Systematic Random Sample
100
An entire set of items from which data can be selected.
Population
100
-12 + 10
-2
200
Za'Quan surveyed 20 students on their favorite flavor of soda.  5 students preferred pineapple soda.  How many students are more likely to prefer pineapple soda if he asks 100 students?
25 students
200
Omarii asks every 3rd student in the lunch line if they prefer apple or orange juice.
Random
200

Ms. Garrett wishes to randomly select 10 students for a lunch meeting to discuss ways to improve school spirit. There are 1500 students in the school.


What is the population for this problem?

1500 students in the school
200
Data collected from every member of a population
Census
200
Mia traveled 240 miles in 6 hours.  How far did she drive per hour?
40 miles
300
Rosemary surveyed 40 students on their favorite sport.  12 students said they prefer baseball.  Based on this information, how many students will prefer baseball if 120 students are asked?
30 
300
Sha'Quan places surveys in people's mailboxes to ask what they think of the new local supermarket.
Random
300

 Suppose you wanted to determine the number of students who have a cell phone across the entire seventh grade.

Suggest and justify a method of surveying students in the seventh grade to obtain a representative sample.

Answers will vary
300
When data are collected from a part of a population.
Sample
300
What is 35% of 45?
15.75
400
Mrs. Berzanskis asked 60 of her 7th grade students what subject they prefer.  40 of her students said math was their favorite subject.  If Mrs. Berzanskis asks 360 students, how many will likely say that math is their favorite subject?
240 students
400
Jimmy surveyed people at a park if they prefer going to the park or to the pool after school.  
Not Random
400
A deli that just opened was giving out free mini sandwiches.  A sample of 50 likely customers was surveyed about which sandwich they preferred.  The people surveyed included 12 people who said they preferred the roast beef sandwich.  Based on this information, how many of the first 150 sandwich orders should the deli predict will be for roast beef?
36
400

When data are gathered from a sample, the characteristic used to describe the sample is called a

Statistic
400
Susan randomly surveyed 1500 7th grade students in her school about what their favorite sport was.  What was the population?
1500 7th Grade Students
500
Shayna surveyed students on their favorite food.  She randomly selected 65 students to take the survey.  She found that 5 students love pizza.  Based on this information, if Shayna asked 78 students their favorite food, how many would prefer pizza?
6 students
500
I randomly asked students at a local library if they prefer to read our play outside.
Not random
500
The head of student council at a school with 200 total students conducts a survey among 30 randomly selected students.  In the survey, he asks each student's first choice for an after-school activity.  Basketball is the first choice for 6 of the students.  Based on these survey results, how many students at the school would be expected to select basketball as an after-school activity?
40 students
500

When data are gathered from a population, the characteristic used to describe the population is called a

Parameter
500
The cost of a hat is $25.  What is the new price of the hat after a 20% coupon is taken off and then 7% tax is added on?
$21.40