Exercept: A manufacturer has 3 tool centers that each make about 1000 tools every day.
In order to implement better quality control procedures, the manager wants to
start sampling the tools made each day to be able to identify issues as quickly as possible.
Which sampling
method would be most appropriate?
To study the mean head size of all people in her state, Jacqueline collects data from 20
people in her town. Which type of sampling is used?
A television station plans to send a crew to a polling center on an election day. Because they do not have time to interview each individual voter, they decide to count voters leaving the polling location and ask every 20th voter for an interview.
What type of sampling is this?
To study the mean respiratory rate of all people in his state, Frank samples the population by dividing the residents by towns and randomly selecting 12 of the towns. He then collects data from all the residents in the selected towns.
Which type of sampling is used?
The management of a large airline wants to estimate the average time
after takeoff taken before the crew begins serving snacks and beverages on their flights.
Assuming that management has easy access to all of the information that
would be required to select flights by each proposed method, which of the following would be reasonable methods of stratified sampling? Select all that apply.
- An executive for a large national restaurant chain with multiple
locations in each of 513 counties wants to personally sample the
cleanliness of the chain’s restaurants throughout the country by
visiting restaurants. The executive wants a good-quality sample
but wants to minimize travel time and expenses.
Which of the following sampling methods would be most appropriate?
A town planner is interested in getting some demographic data
about the households in the city. The city has four wards with the following
numbers of households: ward A
has 2,107, ward B has 903, ward C has 1,505, and ward D has 1,499.
The budget for the project allows the planner to survey 100 households.
She plans to use a stratified sampling method.
What number of households should be chosen from ward B? Enter a whole number.