Ch. 12 Sampling Methods

OBJECTIVES

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HW

REMINDERS

Read 280 - 289Ch. 12 # 24, 26, 28, 30

HW Discussion

Sampling Methods

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SRS

Every possible sample has an equal chance of being selected

Every person, every combination of people, just everything

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POPULATION STRATIFIED SAMPLE

POPULATION

Each cluster is representative of the entire population.

CLUSTER SAMPLE

HW # 14

We need to survey a random sample of 300 passengers on a flight from San Francisco to Tokyo. Name the sampling method described.

a. Pick every 10th passengerb. From the boarding list, randomly choose 5 people flying first class and 25 of the other passengers.c. Randomly generate 30 seat numbers and survey passengers who sit there.d. Randomly select a seat position (right window, right aisle, ...) and survey all the passengers sitting in those seats.

We need to survey a random sample of 300 passengers on a flight from San Francisco to Tokyo. Name the sampling method described.

a. Pick every 10th passenger SYSTEMATICb. From the boarding list, randomly choose 5 people flying first class and 25 of the other passengers. STRATIFIEDc. Randomly generate 30 seat numbers and survey passengers who sit there. SIMPLEd. Randomly select a seat position (right window, right aisle, ...) and survey all the passengers sitting in those seats. CLUSTER