Home > CCA > Chapter 10 > Lesson 10.2.3 > Problem 10-59
Delenn is re-examining the difference in backpacks among different grade levels at her school. (She previously collected data in Lesson 8.1.3.) Now she has collected a new random sample of 100 students to see if there are categorical relationships between carrying backpacks and graduating classes.
Freshmen | Sophomore | Junior | Senior | |
---|---|---|---|---|
Backpack | 8 | 16 | 18 | 19 |
No Backpack | 3 | 6 | 14 | 16 |
TOTAL | 11 | 22 | 32 | 35 |
Based on her sample, what percentage of students do not carry a backpack at school?
What is the total number of students at Delenn's school?
What is the total number of students who do not carry a backpack?
Use those numbers to find the percentage.If a junior is chosen, what is the probability they are carrying a backpack?
Use the same method as part (a), but limit the numbers to juniors only.
If a student is not carrying a backpack, what is the probability they are a junior or senior?
Is there a relationship between graduating class and carrying a backpack at school? Show your evidence.
Create a relative frequency table to help you answer this question.
Look at the table you created.
Which classes have a greater frequency of carrying a backpack?