STATS sampling methods

Suppose that 10,000 lottery tickets are sold and 5 are drawn as the winning tickets. Each collection of 5 tickets that can be formed is equally liked to comprise the group of 5 that is drawn.

• Sample of Convenience

• Cluster Sampling

• Simple Random Sample

• Systematic Sampling

A physical education professor wants to study the physical fitness levels of 20,000 students enrolled at her university. She obtains a list of all 20,00 students numbered 1 to 20,000 and uses a computer random number generator to generate 100 random integers between 1 and 20,000, then invites the 100 students corresponding to those numbers to participate in the study.

• Simple Random Sampling

• Systematic Sampling

• Voluntary Response.

• Simple Random Sample

A construction engineer has just received a shipment of 1000 concrete blocks. The blocks have been delivered in a large pile. The engineer wishes to investigate the crushing strength of the blocks by measuring the strengths in a sample of 10 blocks.

• Systematic Sampling

• Sample of Convenience

• Simple Random Sample

• Sysymatic Sampling

A company has 800 full time and 200 part time employees. To draw a sample of 100 employees, a simple random sample of 80 full-time employees is selected and a simple random sample of 20 part-time employees is selected.

• Voluntary Response

• Stratified Random Sampling

• Systematic Sampling

• Cluster Sampling

To estimate the unemployment rate, a government agency draws a simple random sample of households in a county. Someone visits each household and asks how many adults live in the household, and how many of them are unemployed.

• Systematic Sampling

• Cluster Sampling

• Stratified Random Sampling

• Sample of Convenience

Automobiles are coming off an assembly line. It is decided to draw a systematic sample for a detailed check of the steering system. The starting point will be the third car, then every fifth car after that will be sampled.

• Cluster Sampling

• Samples of Convenience

• Simple Random sample

• Systematic sampling

A radio announcer invites people to call the station to tell them their opinion on Los Pericos.

• Simple Random Sample

• Stratified Random Sample

• Voluntary Response

• Sample of Convenience

57% of the teachers at Central High school are female.

• Statistic

• Parameter

In a sample of 100 surgery patients who were given a new pain reliever, 78% of them reported significant pain relief.

• Statistic

• Parameter