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Sampling

Worksheet 1

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Permutations and Combinations Worksheet I am ________________________________ Today is______________________in_____ Evaluate each permutation or combination: 1. 7P3 =210 2. 7P4 = 5040 3. 7P7 = 5040 4. 8C3 = 56 5. 8C5 ? 7C3 = 1960 6. 7C2 = 21 Find the number of possibilities (you must show your work). 7. The ski club with ten members is to choose three officers captain, co-captain & secretary, how many ways can those offices be filled? 720 8. You are on your way to Hawaii (Aloha) and of 15 possible books your parents say you can only take 10. How many different collections of 10 books can you take? 3003 9. For a segment of a radio show, a disc jockey (Dr. Jams) can play 4 songs. If there are 8 to select from,

Chapter 19 Answer Key

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Chapter 19 Confidence Intervals for Proportions 339 Chapter 19 ? Confidence Intervals for Proportions 1. Margin of error. He believes the true proportion of voters with a certain opinion is within 4% of his estimate, with some degree of confidence, perhaps 95% confidence. 2. Margin of error. He believes the true percentage of children who are exposed to lead-base paint is within 3% of his estimate, with some degree of confidence, perhaps 95% confidence. 3. Conditions. a) Population ? all cars; sample ? 134 cars actually stopped at the checkpoint; p ? proportion of all cars with safety problems; p? ? proportion of cars in the sample that actually have safety problems (10.4%). Plausible Independence condition: There is no reason to believe that the safety problems

STATISTICS!!

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Statistics Review Test 1 College Now Chapter 1: ? Data consists of information coming from observations, counts, measurements, or responses. The singular for data is datum. ? Statistics is the science of collecting, organizing, analyzing, and interpreting data in order to make decisions. ? A population is the collection of all outcomes, responses, measurements, or counts that are of interest. ? A sample is a subset of a population. ? A Parameter is a numerical description of a Population characteristic. ? A Statistic is a numerical description of a sample characteristic. ? Descriptive statistics ? branch of statistics that deals with the organization, summarization, and display of data
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