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Unit 1: Let’s Get StartedPowerPoint Presentation

Unit 1: Let’s Get Started

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Unit 1: Let’s Get Started

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Unit 1: Let’s Get Started

Day 2 Notes

Where is this used? Who thought of this?

Statistics today…

We see on TV…

4 out of 5 doctors recommend…

We see on TV…

Obama leads by 3% (+ or – 4 %)

Statistics is…

A way to convert numbers into useful information so that good decisions can be made.

- How are statistics used today?

Manufacturing

Medical Studies

Advertisements

Management

Government

Sports

- The Bible: Moses (3000 + years ago)
- European mathematicians
- Sir William Petty (1532)
- First accounts of deaths in London on a weekly basis

- James Bernoulli (Swiss, 1600’s)
- Probability of a sequence of events

- Thomas Bayes (English, 1700’s)
- Probability concepts

- Sir William Petty (1532)

- 20th century ROCKS for statistics
- William Gossett
- Student’s t-distribution
- Guinness brewery in Dublin, Ireland

- Student’s t-distribution
- W. Edwards Deming (1950’s and 1960’s)
- Used statistics with Japanese manufacturers

- William Gossett

- Descriptive or Inferential
- Descriptive:
- Summarizing or displaying data so we can quickly obtain an overview
- Easier, calculator-friendly

- Inferential:
- Making claims or drawing conclusions about a population based upon a sample of data from that population.

- Comparing the average attention span of GHS students to the average attention span of their dogs
- Estimating the average attention span of GHS students based upon the attention span of those in Mrs. Brittenham’s class

- Based on a recent sample, I am 95 percent certain that the average age of my customers is between 32 and 35 years old.
- The average salary for male employees in a particular job category across the country was higher than the female employees’ salary, based on a random survey.

- Population:
- All possible measurements or outcomes that are of interest to us in a particular study
- Examples:
- All GHS students
- Citizens of Bowling Green
- All females in America

- Examples:

- All possible measurements or outcomes that are of interest to us in a particular study

- Sample:
- A portion of the population that is representative of the population from which it is selected
- Random selection of 50 GHS males
- Random selection of 200 Bowling Green citizens
- Random survey of 300 females in America

- A portion of the population that is representative of the population from which it is selected

- Identify each of the following statistics as either descriptive or inferential.

1

73% of Asian American households in the US own a computer.

- Identify each of the following statistics as either descriptive or inferential.

2

Households with children under the age of 18 are more likely to have access to the Internet (62%) than family households with no children (53%).

- Identify each of the following statistics as either descriptive or inferential.

3

Hank Aaron hit 755 career home runs.

- Identify each of the following statistics as either descriptive or inferential.

4

The average SAT score for incoming freshmen at a local college was 950.

- Identify each of the following statistics as either descriptive or inferential.

5

On a recent poll, 67 percent of Americans had a favorable opinion of the President of the United States.

- In each of the following, identify the population and the sample.

6

A local politician wants to know the proportion of Warren County residents who support her. She takes a list of registered Democrats and randomly selects 1000 to ask if they support her.

- In each of the following, identify the population and the sample.

7

Greenwood’s basketball coach wants to know the average height of boys at Greenwood. He randomly selects 50 boys and records their height.