1.1 Stuff
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1.1 Stuff
Data consist of information coming from observations, counts, measurements, or responses.
Statistics is the science of collecting, organizing, analyzing, and interpreting data in order to make decisions.
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1.1 Stuff
The study of statistics has two major branches:
Descriptive statistics is the branch of statistics that involves the organization, summarization, and display of data.
Inferential statistics is the branch of statistics that involves using a sample to draw conclusions about a population.
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1.1 Try It Yourself 3
A survey conducted among 1,017 men and women by Opinion Research Corporation International found that 76% of the women and 60% of the men had had a physical examination within the previous year.
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1.1 Stuff
There are two types of data sets used in statistics:
a population is the collection of all outcomes, responses, measurements, or counts that are of interest.
a sample is a subset, or part, of a population.
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1.1 Population or Sample?
The height of each player on a school’s basketball team (#11)
A survey of 500 spectators from a stadium with 42,000 spectators (#13)
The number of televisions in each U.S. household (#16)
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1.1 Exercise #30
A survey of 496 students at a college found that 10% planned on traveling out of the country during spring break.
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1.1 Stuff
A parameter is a numerical description of a population characteristic.
A statistic is a numerical description of a sample characteristic.
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1.1 Parameter or Statistic?
Is the numerical value a parameter or statistic?
The average annual salary for 35 of a company’s 1200 accountants is $68,000. (#35)
In a recent year, the average math scores for all graduates on the ACT was 21.0. (#42)