Sampling and Collecting Data

The president of a college randomly selects 2 students from each department to serve on a student advisory board.

• Convenience

• Systematic

• Stratified

• Simple Random

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She selects the five closest to her desk.

• simple random

• Self Selected.

• Convenience

• Systematic Random

A set of observations that constitute PART of the population.

• Statistic

• Census

• Population

• Sample

Sampling method that consists of n individuals from the population chosen in such a way that every individual has an EQUAL chance of being selected.

• Stratified Sampling

• Simple Random Sampling (SRS)

• Cluster Sampling

• Systematic Sampling

The process of collecting information/data from the sample.

• Census

• Interview

• Survey

• Questionnaire

A quantity calculated from the observations in a SAMPLE.

• Parameter

• Study

• Statistic

• Observation

Sampling method that in which the population is divided into HOMOGENEOUS groups and SRS’s are pulled from each group.

• Stratified Sampling

• Simple Random Sampling (SRS)

• Cluster Sampling

• Systematic Sampling

The manager of a shopping mall distributed a customer-satisfaction survey by handing it to people as they came through one of the doors to the mall one day. Of those handed out, 215 were completed and returned. Should the results of the survey be generalized to the population of all customers of the shopping mall?

• Yes, because the sample size is large.

• Yes, because only people entering the mall were given the survey.

• Yes, because the sample was representative.

• No, because a random sample from all customers of the shopping mall was not selected.

• No, because not all customers were selected.

Which of the following is a benefit to using a random sample for an observational study?

• The random sample allows for different treatments to be assigned.

• A causal relationship can be determined.

• The results of the observational study can be generalized to the population.

• A random sample is the easiest method of data collection.

• The distribution of the sample will match the distribution of the population.

Matt wants to investigate the opinions of young adults in the country, ages 18 years to 25 years, about time spent playing video games. He plans to administer a survey to a sample of people. Which of the following samples is most likely to generalize to his population of interest?

• A nationwide sample of people ages 18 to 25

• A sample of attendees of a gaming convention

• A sample of people ages 18 to 25 in Matt’s hometown

• A sample of people who click on a link in an online gaming site

• A sample of people who buy video games from an online store