To explain: The sampling method used to estimate how many of the 3000 air filters in a 30-story building need replacing.
The sampling method used to estimate how many of the 3000 air filters in a 30-story building need replacing by examining five filters chosen at random on each floor is known as the Stratified sampling method.
Given:
A study is conducted to estimate how many of the 3000 air filters in a 30-story building need replacing. The crew examines five filters randomly chosen on each floor of the building.
Concept used:
The stratified sampling method is where certain groups or strata are formed based on a criterion and then a few from each group are randomly selected to form a sample to study the population parameter.
Explanation:
The sample was selected by selecting five filters on each floor. Here the filters on each floor are made into groups known as strata and then randomly five filters from each floor are considered for the study. Thus the sampling method used in this study is the Stratified sampling method. The sample was selected randomly selecting five filters from each floor. Thus there is no bias as the sample selection is randomly done.
Chapter 11 Solutions
High School Math 2015 Common Core Algebra 2 Student Edition Grades 10/11
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