Populations and Samples
Drawing Inferences
Mean, Median, Mode, Range
Comparative Inferences Box Plots
100
Out of a group of 40 volunteers, 23 people are chosen to participate in a survey about the number of times they get coffee each morning. What is the sample in the situation?
The 23 people who are chosen to participate in the survey
100
A population of middle school students consists of 100 boys and 250 girls. If a representative sample from this population contains 25 girls, how many boys would be expected in this sample?
10 boys
100
What is the mean of the following numbers:
2, 3, 4, 6, 8, 10
5.5
100
Which box plot has the greater median?
Jonah
200
During the Willowcreek basketball game, every spectator placed his or her ticket stub into one of several containers. After the game, the coach chose twelve people to receive a free bag of chips from the concession stand. What is the sample in the situation?
The 12 people to receive a free bag of chips from the concession stand
200
A random survey was conducted about students' favorite fruits. Ten students voted for apples, 12 students voted for oranges, and 3 students voted for bananas. Rachel concludes that 240 of the 600 students in the school are expected to prefer apples . Is her conclusion valid? Explain.
Rachel's conclusion is valid. 10/25 can be written as 240/600
200
What is the median of the following numbers?
3, 4, 6, 8, 12, 2, 9
6
200
Which box plot has greater variability? How can you tell?
Finn's box plot is longer which means it has greater variability
300
A group of students is studying the number of people who like watching sports in their school. They surveyed everyone in their school. Identify the population. What is the population?
Everyone in their school
300
Using the Dot Plots, which set of math homework was more challenging?
Set 1
300
What is the mode of the following numbers?
1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5
4
300
Which grade has the greater median height?
7th grade
400
What is the population of Willowcreek?
Several answers: Teachers, students, janitors, lunch workers, principals, bus drivers etc
400
Jacob wants to convince his dad that he should be allowed to increase his weekly internet usage at home from 5 hours a week to 7 hours a week. Can Jacob use this data to present a valid inference that will convince his dad? Explain.
Yes, most students use the internet 7 or more hours in a week
400
What is the range of the following numbers:
2, 5, 8, 10, 12, 15, 20
18
400
Which grade has greater variability in their heights?
7th grade has greater variability in their heights because the box is longer
500
Name the 3 types of samples
Simple Random Sample
Systematic Sample
Convenience Sample
500
Jimmy surveyed a random sample of students at school to collect data about the number of books they read this semester. Use the data in the table to create 2 valid inferences
Students have read 2 books more than any other number of books
More than 10 students have read at least 2 books
500
What is the mode of the following numbers:
2, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7
7
500
What is the IQR for both 6th and 7th grade?
6th grade: 12
7th grade: 10