Vocabulary
Question 1
the ratio of the number of people who chose mango to the total number of people surveyed
marginal relative frequency
Question 3
the ratio of the number of adults who chose strawberry to the total number of people surveyed
joint relative frequency
Question 2
the ratio of the number of children who chose strawberry to the total number of people who chose strawberry
conditional relative frequency
A _______________ is a table that displays two-variable data by organizing it into rows and columns.
Two-way table
Question 5
Two hundred twenty students were surveyed about whether a mural should be painted on a wall of the cafeteria. Complete the two-way table showing the results of the survey.
88, 108
219
182
A ____________ is the frequency in a particular category divided by the total number of data values.
Joint relative frequency
A _____________ is the frequency of a specific data value divided by the total number of data values in the set.
Relative Frequency
A ___________ is a two-way table that displays relative frequencies.
Two-way Relative Frequency Table
Question 10
The table shows data for a random sample of flights for a particular airline. Complete the table. Based on the table, what is the conditional relative frequency that a flight will be on time given that it is a morning flight?
.8=80%
A __________ is the sum of the joint relative frequencies in a row or column of a two-way table.
Marginal relative frequency
Question 7
Three hundred students were surveyed about whether they are right- or left-handed. Complete the two-way relative frequency table.
.46, .51
.43, .06
.11
Question 9
A random sample of 200 students at a school were surveyed about whether they prefer red or blue as a new school color. Complete the relative frequency table. Based on the table, select all the true statements.
A More 8th graders were surveyed than 7th graders.
B More of the surveyed students prefer red than prefer blue.
D A randomly selected 7th grader at the school is more likely to prefer red than blue.
Question 4.
What does it mean when a two-way table shows an association between two data sets?
The two data sets are related to each other.
Question 6
Three hundred people at a movie theater were asked whether they bought popcorn or a drink at the theater. How many more people surveyed did NOT buy popcorn than did buy popcorn? State what strategy and tool you will use to answer the question, explain your choice, and then find the answer.
81
219
134, 166, 300
138 people.
Question 8
Five hundred randomly-selected voters were surveyed about whether they support a new park. The two-way table shows the results of the survey. Which statement is best supported by the survey results?
D. Voters under age 40 are more likely to be for the park than voters aged 40 or older.