1.1 An Overview of Statistics Mrs. Leonard Elem Stat.
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Transcript of 1.1 An Overview of Statistics Mrs. Leonard Elem Stat.
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1.1 An Overview of Statistics
Mrs. LeonardElem Stat
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Vocabulary
• Data –
• Statistics –
information coming from observations, counts, measurements, or responses
the science of collecting, organizing, analyzing, and interpreting data in order to make decisions
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Vocabulary
• Population –
• Sample -
the collection of ALL outcomes, responses, measurements, or counts of interest
subset of a population
Ex. - All the students at CGHS
Ex. - The Senior Class
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Population: the responses of all American adults
Sample: the responses of the 1708 adults in the survey
Data Set: the 939 yes’s and the 769 no’s
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Vocabulary
• Parameter –
• Statistic –
numerical description of a Population characteristic
numerical description of a Sample characteristic
Examples of both are means or standard deviation.
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1) Statistic – because we are looking at a sample of MBA’s2) Parameter – because we are looking at all the graudates
from the University of Chicago3) Statistic – because we are looking at a sample of stores
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Vocabulary
• Descriptive Statistics –
• Inferential Statistics –
branch of statistics that involves the organization, summarization, and display of data
branch of statistics that involves using a sample to draw a conclusion about a population
Ex. - 67% of the pets at my house are dogs, while 33% are cats.
Ex. - I have more dogs than cats.
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1) Descriptive Statistics – “For unmarried men, 70% were alive at age 65. For married men, 90% were alive at age 65.”
Inferential Statistics – Married men live longer than unmarried men.
2) Descriptive Statistics – “44% of Wall Street analysts incorrectly forecasted high-tech earnings in a recent year.”
Inferential Statistics – The Stock Market is difficult to forecast.
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More Practice
1) The US Dept of Energy conducts weekly surveys of 800 gasoline stations to determine the average price per gallon of regular gasoline. On July 10, 1998, the average price was $1.066 per gallon. a) Identify the population.b) Identify the sample.c) What does the data set consist of?
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More Practice
2) In 1997, major league baseball teams spent a total of $1,119,537,215 on players’ salaries. Does this numerical value describe a parameter or a statistic?
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More Practice
3) A survey conducted among 1017 men and women by Opinion Research Corporation found that 76% of women and 60% of men had a physical examination within the previous year. a) Identify the descriptive aspect of the survey.b) What inferences could be drawn from this
survey?
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Answers to More Practice
1) a)b)c)
2)
3) a)
b)
All Gas StationsThe 800 Gas StationsPrice Per Gallon at each of the 800 Stations
Parameter, because we are dealing with a population.
76% of women and 60% of men has a physical the previous year
Women care more about their health
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Homework
TextbookPg. 8-10
(2, 4, 5, 6, 12, 14, 16, 20, 24, 40)