BackA store surveys its target demographic and learns that 86% of people would purchase the product they’ve been heavily advertising. Is this an experiment or an observational study? Can they conclude their current advertising strategy caused the high percentage of interest?
A regional store manager wants to test whether increasing store hours increases profits, so they randomly select half of their locations to stay open an extra hour later in the evenings and compare profits between stores at the end of the month. They notice that stores open later saw higher profits on average. Is this an experiment or an observational study? Can they determine the extra hours caused the increase in sales?
An office manager wants to determine how employees feel about their personal growth and professional achievement in the last quarter. Should they run an observational study or experiment?
A software development company created a new app for fitness, and they want to determine if using the app can lead to weight loss and increased strength in customers. Should they run an observational study or experiment?
"Determine whether the statement is true or false. If it is false, rewrite it as a true statement.
It is impossible to obtain all the census data about the U.S. population."
"Determine whether the data set is a population or a sample. Explain your reasoning.
The salary of each employee of an advertising firm"
"Determine whether the data set is a population or a sample. Explain your reasoning.
A survey of 250 members from an organized union of over 20,000 members"
"Identify the population and the sample. Describe the sample data set.
A survey of 1500 U.S. adults found that 59% have never had a vaccine reaction. (Source: SingleCare)"
"Identify the population and the sample. Describe the sample data set.
To gather information about starting salaries at companies listed in the Standard & Poor’s 500, a researcher contacts 74 of the 500 companies."
Determine whether the data set is a population or a sample. Explain your reasoning.
The annual revenue of each team in a pro sports league
Determine whether the data set is a population or a sample. Explain your reasoning.
The number of guests in each room of a hotel
Use the Venn diagram to identify the population and the sample.
Use the Venn diagram to identify the population and the sample.
Identify the population and the sample. Describe the sample data set.
A survey of 214 of the seniors graduating with a bachelor of science degree from a university found that 15% planned to obtain entry-level jobs in the health field.
What is the difference between a census and a sampling?