a student is curious about the average age of a penny in circulation. the student collects pennies for a few…

a student is curious about the average age of a penny in circulation. the student collects pennies for a few months and places them in a jar. once the jar is full, the student mixes up the pennies, randomly selects 100 of them, records the age of each penny selected, and finds the average age. which of the following best describes the way the average age of a penny in circulation was determined? this is a sample survey. this is an observational study. this is an experiment that used a controlled group. this is an experiment that did not use randomization.

a student is curious about the average age of a penny in circulation. the student collects pennies for a few months and places them in a jar. once the jar is full, the student mixes up the pennies, randomly selects 100 of them, records the age of each penny selected, and finds the average age. which of the following best describes the way the average age of a penny in circulation was determined? this is a sample survey. this is an observational study. this is an experiment that used a controlled group. this is an experiment that did not use randomization.

Answer

Answer:

This is a sample survey.

Brief Explanations:

The student randomly selected 100 pennies from the full - jar (a subset of all pennies in circulation) to find the average age, which is characteristic of a sample survey. In an observational study, there is no intervention or selection of a sample for a specific statistic calculation like this. An experiment with a controlled group would involve manipulation of variables, which is not the case here. Also, the student did use randomization in selecting the pennies.