6.4 Select and draw conclusions from samples. GOAL: study different sampling methods for collecting data. Sample: subset of the population. Self-selected sample , members of a population can volunteer to be in the sample.
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6.4 Select and draw conclusions from samples
GOAL: study different sampling methods for collecting data.
Sample: subset of the population
Self-selected sample, members of a population can volunteer to be in the sample.
Systematic sample, a rule is used to select members of a population, such as selecting every other person.
Convenience Sample, easy-to-reach members of a population are selected, such as those in the first row
Random Sample, each member of a population has an equal chance of being selected
Example 1:A teacher wants to find out how many hours students studied for a history quiz. Identify the type of sample described.
Self selected Sample
Biased vs Unbaised
Underrepresent the population
Represents the population
Tell whether each the following samples are biased or unbiased
Margin of Error
Between 16.5% and 23.5%
2. Tell whether the sample in Exercise 1 is biased or unbiased. Explain.
3.In a survey of 1100 home buyers, 90% said they used a real-estate agent to research home listings. What is the margin or error? Give an interval that is likely to contain the exact percent of all home buyers who used a real-estate agent to research home listings.
Between 87% and 93%
Workbook Page 258 1-24
Homework: Textbook Page 230: 1-17