PPT-Proportions

Proportions What are proportions If two ratios are equal they form a proportion Proportions can be used in geometry when working with similar figures What do we mean by similar Similar describes things which have the same shape but are not the same size. 1 A blouse that regularly sells for 2850 is on s ale for onethird off What is the sale price of th e dress 1900 2 If 14 out of 24 students in a college class are men then to the nearest tenth of a percent what percent of the class is composed of men 1 A blouse that regularly sells for 2850 is on s ale for onethird off What is the sale price of th e dress 2 If 14 out of 24 students in a college class are men then to the nearest tenth of a percent what percent of the class is composed of men 3 A . To test claims about inferences for two proportions, under specific conditions. 8.4: two-proportion inference tests. Proportions observed in independent random samples . are. independent. Thus, we can add their variances. So…. In this section we will be able to give real life examples of Fractions and Proportions. We will also learn how to solve and evaluate Fractions and Proportions in word problems.. Lesson plan goals. We are constantly using fractions everyday. Most of the time not really even noticing that we are using fractions. Have you ever checked the clock or a watch for the time? Guess what the time is a fraction of a day so any time you use a watch, clock. . Pythagoras (560-480 BC), the Greek geometer, was especially interested in the golden section, and proved that it was the basis for the proportions of the human figure. He showed that the human body is built with each part in a definite golden proportion to all the other parts.. Ratios. A . ratio. is a comparison of . two. numbers.. Example: Tamara has 2 dogs and 8 fish. The ratio of dogs to fish can be written in three different ways. ..  .  . ***. Be careful with the . 3/28/17. How do we write ratios?. How do we write and simplify rates?. How do we decide whether two ratios/rates are proportional?. Today We’ll Discuss. Definition:. The . ratio. of two numbers . two-proportion inference tests. Chapter 22. Proportions observed in independent random samples . are. independent. Thus, we can add their variances. So…. The standard deviation of the difference between two sample proportions is . Difference Between Proportions. Sometimes we want to see if there is a significant difference between independent groups.. Control group vs. treatment group or placebo group. Men vs. women. Last year vs. this year. Yawn Seed?. Subject. Yawned?. Yes. No. Total. Yes. 10. 4. 14. No. 24. 12. 36. Total. 34. 16. 50. Trial. Number who yawned in yawn seed group. Number who yawned in no yawn seed group. Difference in proportions (yawn. AP Statistics. Unit 5. The Central Limit Theorem for Sample Proportions. Rather than showing real repeated samples, . imagine. what would happen if we were to actually draw many samples.. Now imagine what would happen if we looked at the sample proportions for these samples. . Textbook Pages 430-435. Objective. I can solve scale drawing problems using proportions.. Vocabulary. Scale Drawing: . is the same shape but not the same size. A map is a scale drawing. The units are very important.. Objective: You will analyze measures and shapes in order to draw facial features in proportion.. DRILL:. Get a mirror and paint pump to set up mirror . (on counter near sink.). Take 10-15 minutes to attempt a first portrait. Chapter 8: Inference for Proportions Lecture Presentation Slides Macmillan Learning © 2017 Chapter 8 Inference for Proportions 8.1 Inference for a Single Proportion 8.2 Comparing Two Proportions