HW #2: Sampling and Data Sources

Judgement

Analyzing 10 stocks that a financial advisor thinks best represents the economy

A researcher is studying obesity levels in a city. Match. The researcher selects 500 people in 2015

Cross sectional

Simple Random Sample (SRS), with replacement

Dropping a ball from 5 feet 50 times, recording the number of bounces after each drop

Voluntary Response

Inviting parent readers of an advise column to answer the following: "If you had to do it over again, would you have children?"

Cluster

Randomly selecting a group of small businesses and then selecting every employee as the sample of small business employees

Systematic

Selecting every fifth invoice in a file

Stratified

Selecting two graduating seniors from each business majpr

A researcher is studying obesity levels in a city. Match. The researcher tracks the % obese in the city each year from 2010 until 2019

Time Series

A major investigation of the safety of anesthetics used in surgery looked at over 850,000 operations performed at 34 hospitals across the USA. The following are the death rates for 4 anesthetics: Brand A - 1.7% Brand B - 1.7% Brand C - 3.4% Brand D - 1.9% This situation is an example of

an observational study

Simple Random Sample (SRS), without replacement

drawing 3 different names from a hat containing every student's name in this class