Unit 7. Day 2..

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Presentation transcript:

Unit 7. Day 2.

We want information on a large population. We don’t/can’t check everything/everybody Q: What do we do? A: We take a sample of the population REPRESENTATIVE Random selection from the larger population Using a goldilocks amount Q: Why is it important that the selection is random? A: Best way to ensure that the sample represents the population

San Bernardino High School 2,000 students 80% Hispanic/Latino 10% Black 10% White/Asian/Other

San Bernardino High School 2,000 students 80% Hispanic/Latino 10% Black 10% White/Asian/Other Is this a good sample?:

San Bernardino High School 2,000 students 80% Hispanic/Latino 10% Black 10% White/Asian/Other Is this a good sample?:

Today’s Lesson Group A: Find the percent of F’s in Period 1 5 Groups Group B: Find the percent of F’s in Period 2 Group C: Find the percent of F’s in Period 3 Group D: Find the percent of F’s in Period 4 Group E: Find the percent of F’s in Period 5

Per 1 F D D F C B C C F C F C 16. 6 % C D C B C D B B A C A C 15 % Per 2 A B C C B D C A C B B C 4. 1 6 % B A C D C D D D F C C D Per 3 C D C B B D B C F C D B 8. 3 % C D C D F A D D B A A C Per 4 B D D C C F A D F F B C 20. 8 3 % B A B C A D B D B F F C Which group has the best (most representative) sample? How could we get a better sample? Per 5 A B C D F A B B F A C F 25 % C B C D C F C F D D A F

15 % F D D F C B C C F C F C C D C B C D B B A C A C A B C C B D C A C Per 1 F D D F C B C C F C F C C D C B C D B B A C A C Per 2 A B C C B D C A C B B C B A C D C D D D F C C D Per 3 C D C B B D B C F C D B 15 % C D C D F A D D B A A C Per 4 B D D C C F A D F F B C B A B C A D B D B F F C Per 5 A C F B C D F A B B F A C F C F D D A F C B C D

15 % Now find the percent of F’s in your random sample B A C D F D D D Group A: 15 % Group B: Group C: Group D: Now find the percent of F’s in your random sample Group E: B A C D F D D D C D A F D A C B A D B A C C C C B D D F A B F C B C C B C F D B B D B C A C C B A A C B B D F F F F B C C D C D A C A D D B A F A C C D C D B A A C F C B F B D B D B F B F C C D B C C C F D C C F C C C C D C D D B F F B D C