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Day 2 random samples Day 2 random samples Document Transcript

  • Day 2 Random Samples.notebook March 06, 2013 AIM: Population and Samples Do Now 1
  • Day 2 Random Samples.notebook March 06, 2013 2
  • Day 2 Random Samples.notebook March 06, 2013 3
  • Day 2 Random Samples.notebook March 06, 2013 Anticipatory Set What proportion of students in Great Hollow Middle  School chooses football as their favorite sport? 1.)  How would you collect your data to come to a  conclusion on this survey question? 2.)  Will your results be the same as all the other  students in this class? 4
  • Day 2 Random Samples.notebook March 06, 2013 Random Sample: Luggage 5
  • Day 2 Random Samples.notebook March 06, 2013 Variability: 6
  • Day 2 Random Samples.notebook March 06, 2013 Sampling Distributions: Elephant Ages 7
  • Day 2 Random Samples.notebook March 06, 2013 Defective Products:  An automobile brake pad  assembly line find that 6% of its brake pads are  defective. 1.)  If I take a random sample of 200 brake pads,  how many would I expect to be defective? 2.)  Suppose I took a different random sample of  200 and found that 15 were defective.  What  percent is defective in my random sample? 3.)  Suppose I took another random sample of 10  brake pads and found that none were defective.   How is that possible? 8
  • Day 2 Random Samples.notebook March 06, 2013 Random Number Generator: Values 1 to 100 represent a defective product and values 101  to 1000 represent a non‐defective product. Sample size 10 Defective Non Defective 9
  • Day 2 Random Samples.notebook March 06, 2013 Random Number Generator: Values 1 to 100 represent a defective product and values 101  to 1000 represent a non‐defective product. Sample size 30 Defective Non Defective 10
  • Day 2 Random Samples.notebook March 06, 2013 Random Number Generator: Values 1 to 100 represent a defective product and values 101  to 1000 represent a non‐defective product. Sample size 30 Defective Non Defective 11
  • Day 2 Random Samples.notebook March 06, 2013 Before You Leave 1.) Was the percent of defective products the same for all our sample? 2.) How did the sample size 10 results compare to the sample size 30? 12
  • Day 2 Random Samples.notebook March 06, 2013 Homework On Core Page 142 #1-6 all 13