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Seminar 8:

Statistics, Part I

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Sampling Techniques

• Random

• Systematic

• Cluster

• Stratified

• Convenience

Cluster Sampling

Stratified Sampling

Sampling Techniques section 8.1

Identify the sampling method:

Faculty members at Cayuga College are classified according to the department in which they teach, and then random samples from each department are taken.

Sampling Techniques section 8.1

Identify the sampling method:

A state is divided into counties. A random sample of 12 counties is selected. A random sample from each of the 12 counties is selected.

Sampling Techniques section 8.1

Identify the sampling method:

Every 17th person in line at a grocery store is asked his or her age.

Sampling Techniques section 8.1

Identify the sampling method:

The businesses in Iowa City are grouped according to type: medical, service, retail, manufacturing, financial, construction, restaurant, hotel, tourism, and other.

A random sample of 10 businesses from each type is selected.

Sampling Techniques section 8.1

Identify the sampling method:

The first 25 students leaving the cafeteria are asked how many hours per week they work.

Misuses of Statistics

Misuses of Statistics section 8.2

Most car accidents occur on Saturday night. That means that people do not drive carefully on Saturday night.

What misuse or misinterpretation exists here?

1.) statement is not valid because of vague wording2.) statement is not valid because information is missing3.) statement is not valid because the conclusion does not relate to the given information4.) statement is not valid because of unknown sample size5.) statement is valid

Misuses of Statistics section 8.2

A steak is more expensive at Dino’s Steak House than at Rick’s Prime Rib House. Therefore, the quality of steak at Dino’s is better than the quality at Rick’s.

What misuse or misinterpretation exists here?

1.) statement is not valid because of vague wording2.) statement is not valid because information is missing3.) statement is not valid because the conclusion does not relate to the given information4.) statement is not valid because of unknown sample size5.) statement is valid

Misuses of Statistics section 8.2

Misleading graphs.

Sales for XYZ, Inc.

50k

45k

40k

JAN FEB MAR

Misuses of Statistics section 8.2

Misuses of Statistics section 8.2

Frequency Distributions

Frequency Distributions section 8.3

Page 345 #13

Statistical Graphs

Statistical Graphs section 8.4

Page 354 #15

Statistical Graphs section 8.4

Page 355 #17

Statistical Graphs section 8.4

Page 356 #24

Statistical Graphs section 8.4

Page 353 #9

Statistical Graphs section 8.4

Joe's total college expenses amount to $28,000 per year.His room and board is $9000. On a circle graph, how many degrees should room and board represent?