2.2+Comparing+Your+Class+to+the+Nation+-+0910

ABP 11-21-09 Math 7


 * BIG IDEA:** Many important practical and mathematical applications involve comparing quantities of one kind or another; it is important to know which method to use and how we should use them.


 * ESSENTIAL QUESTION:** What methods are there for comparing things?

**__Notes__****:**
 * __2.2__** **– __Comparing Your Class to the Nation__**

-When total numbers in two different data sets are very different, percents are a useful way to compare the data.

Math 7E Class data:
 * __ Journal Problem 2.2 __**
 * Activity || Boys || Girls ||
 * Soccer || 8 || 4 ||
 * Swimming || 4 || 6 ||
 * Volleyball || 2 || 4 ||
 * Basketball || 8 || 5 ||
 * Cricket || 6 || 0 ||
 * Biking || 6 || 7 ||
 * Camping || 2 || 2 ||
 * Fishing || 2 || 0 ||
 * Walking || 7 || 6 ||
 * **Total in group** || **9** || **9** ||

-50% of the campers are male. -60% of the swimmers are female. -100% of the fishers are male.
 * A. Look back at the three statements you wrote in part B of problem 2.1 comparing the numbers of male and female participations in the various activities. Now, make the same comparisons for boys and girls in your class. **

-In the national survey, 55% of the swimmers are female, and in my class survey, 60% of the swimmers are male. The difference is 5%. -In the national survey, 67% of the fishers are male, and in my class survey, 100% of the fishers are male. The difference is 33%. 1. –The ratio of 12-17 year olds in the national survey who swim and don't swim is 10,874,000:10,430,000, and the ratio of boys and girls in my class who swim and don't swim is 10:8 -The percent of 12-17 year olds in the national survey who bike is 41%, and the percent of boys and girls in my class who bike is 72%. The difference is 31%. -The percent of 12-17 year olds in the national survey who exercise walk is 13%, and the percent of boys and girls in my class who exercise walk is 72%. The difference is 59%.
 * B. Compare the statements about your class data to the statements about the national data. **
 * -**In the national survey, 54% of the campers are male, and in my class survey, 50% of the campers are male. The difference is 4%.
 * C. Write three statements comparing sports activities of all students in your class to those of **
 * 1. 12-17 year olds in the national survey **
 * 2. 55-64 year olds in the national survey **

2. –The ratio of 55-64 year olds in the national survey who camp and don't camp is 2,355,000:18,567,000, and the ratio of boys and girls in my class who camp and don't camp is 4:14. -The percent of 55-64 year olds in the national survey who fish is 15%, and the percent of boys and girls in my class who fish is 11%. The difference is 4%. -The percent of 55-64 year olds in the national survey who swim is 13% and the percent of boys and girls in my class who swim is 56%. The difference is 43%.

My class data is similar to the national data in a few ways. One similarity is that more girls prefer swimming than boys. Another similarity is that the number of boys and girls who bike are almost equal. My class data is also different to the national data. One difference I found is that a higher percentage of people in my class walk than the percentage of people from the national survey. This may be because there is more traffic in Bangladesh, so people choose to walk.
 * __ Journal Problem 2.2 Follow Up __**
 * 1. Write a paragraph telling how your class data is like the national data and how it is different. For any ways in which your class data appears to be different from the national data, give reasons why you think your class is different. **

-The ratio of boys and girls who play basketball is 8:5. -67% of the volleyball players are female. -The number of boys who play soccer is 2 times the number of girls who play soccer.
 * 2. In your class survey, you added several activities to the five listed in the national survey. Write at least three statements comparing the number of boys and girls in your class who participate in these activities. **