1. 13.3 & 13.5 13.3 Find Probabilities Using Combinations 13.5 Analyze Surveys and Samples

2. VOCABULARY 13.3

3. EXAMPLE 1- COUNTING COMBINATIONS AND USING A FORMULA You order a sandwich at a restaurant. You can choose 2 side dishes from a list of : french fries, onion rings, side salad, or cole slaw. Find the combinations by: Counting Formula

4. EXAMPLE 2- COMBINATIONS Evaluate the expression. 1. 8 C 5 2. 11 C 4

5. EXAMPLE 3- PERMUTATIONS OR COMBINATIONS? Tell whether the question can be answered using combinations or permutations. 1.Ten students are auditioning for 3 different roles in a play. In how many ways can the 3 roles be filled? 2.Six students are selected from the audience of 700 people at the assembly to participate in the demonstration. How many groups of six students are possible?

6. 13.5 Vocabulary

7. SAMPLE/QUESTION- BIASED?

8. EXAMPLE 1- POPULATIONS AND SAMPLES Identify the population and classify the sampling method. 1.A restaurant manager wants to evaluate the restaurant’s quality of service. Diners are given mail-in comment cards. 2.Your school wants to know if students are satisfied with the school’s intramural activities. On each team, every tenth student on an alphabetized list is surveyed. 3.A speaker wants opinions of people in the audience. Every person attending has a ticket with their name on it which is put into a basket. 10 tickets are drawn from the basket.

9. EXAMPLE 2- BIASED SAMPLES? Tell whether the sampling method used is likely to result in a biased sample. Explain. 1.A family wants to gather information from other residents on their street about forming a neighborhood watch. They survey every third house on both sides of the street. 2.The American Nurses Association wanted to gather information about the working environment for nurses in hospitals. A survey for nurses was posted on the association’s website.

10. EXAMPLE 3- BIASED QUESTIONS Tell whether the question is potentially biased. Explain your answer. 1.Do you support the incumbent’s tax plan or the challenger’s tax plan? 2.Do you prefer the ease of shopping online anytime or going to the store during their limited hours?

11. HOMEWORK 13.5 B Worksheet AND Pages 858-859 #4-18 even and 28, 32