Birds of a feather flock together, so it's easy to estimate their number. Pupils watch an installment of a larger Real-Life Math series in which a zookeeper explains how she uses math to estimate the number of birds. They then try out...

How many of you found the video to be useful? Young statisticians learn about surveys in the 10th installment of the Crash Course Statistics playlist. An informative video describes different sampling methods and possible sources of bias.

Sampling techniques scientists use, including coning and quartering, as well as aliquots, are the focus of a video that also looks at homogeneous and heterogeneous mixtures.

Experimental design can be both incredibly intuitive and very high-concept when first introduced to learners. This video does a great job of discussing sampling methods and bias simply, without over-reducing...

Hopefully, there's nothing random about the decision to use the resource. Scholars view an informative video on random sampling. They watch as the narrator works through several examples on the topic.

Be stupefied by stratified sampling. Viewers of a short YouTube video learn about stratified sampling. Given information on the number of people majoring in a particular subject, they decide how many of each major they need to create a...

Deciding what to wear can be difficult, but it helps if you know your options. Use a tree diagram to solve word problems like the one in this video! Class members can watch and learn how to find and count possible outcomes (or outfits)....

This lesson will explain multi-stage sampling. It is 1 of 4 in the series titled "Multi-stage Sampling."

This lesson will explain multi-stage sampling. It is 1 of 4 in the series.

A look at various types of estuary grasses and the animals that are sheltered in this habitat, plus a look at the methods scientists use to study these grasses. [6:10]

Unbiased sampling methods are explored in this video lesson. The tutorial describes and provides examples of random sampling, systematic sampling, and stratified sampling.

Evaluating External Validity. This lesson is 2 of 6 in the series titled "Evaluating External Validity."

Evaluating External Validity. This lesson is 3 of 6 in the series titled "Evaluating External Validity."

Evaluating External Validity. This lesson is 5 of 6 in the series titled "Evaluating External Validity."

This lesson introduces and defines external validity. It is 3 of 6 in the series titled "External Validity."

This lesson introduces and defines external validity. It is 5 of 6 in the series titled "External Validity."

This lesson will explain multi-stage sampling. It is 2 of 4 in the series.

Here we explore the definition of a sample in terms of statistics. This lesson is 2 of 4 in the series titled "Samples."

Here we explore the definition of a sample in terms of statistics. This lesson is 4 of 4 in the series titled "Samples."

This lesson discusses the relationship between sampling and external validity. It is 2 of 6 in the series titled "Sampling and External Validity."

This lesson discusses the relationship between sampling and external validity. It is 4 of 6 in the series titled "Sampling and External Validity."

This lesson discusses the relationship between sampling and external validity. It is 6 of 6 in the series titled "Sampling and External Validity."

This lesson demonstrates how sampling can help predict outcomes. It is 2 of 2 in the series titled "Sampling and prediction."

This lesson demonstrates how sampling can help predict outcomes. It is 4 of 2 in the series titled "Sampling and prediction."