표본평균

What is the sample mean?

• The average size of all the marbles in the bag.
• The average size of the marbles you picked out.
• The difference between the largest and smallest marble.
• The total number of marbles in the bag.

What does the sample variance tell you about the marbles?

• How many marbles are in the bag.
• How much the marbles differ from the average.
• How many different colors of marbles there are.
• How big the biggest marble is.

How is the sample mean different from the population mean?

• The sample mean is the average of all the marbles, while the population mean is the average of just a few.
• The sample mean is the average of just a few marbles, while the population mean is the average of all the marbles.
• The sample mean is the size of the biggest marble, while the population mean is the size of the smallest marble.
• The sample mean is the total number of marbles, while the population mean is the average size of the marbles.

What is the population mean?

What is the population variance?

How is the sample variance different from the population variance?

Think about a time you were asked to represent a group of people. How did you try to make sure you represented everyone in the group fairly?

Think about a time you were part of a group where everyone was very similar. What made the group similar? How was it different from a group where everyone was very different?

Think about a time you were asked to pick a few things from a larger group. How did you choose what to pick? Did you try to pick things that were similar or different?