I think we need a new teacher; this one keeps asking us for the answers! The video walks through how to solve for sample size when you are given a z score, proportion, and margin of error. It also explains a graph of the relationship...

When does .2 round up rather than down? The example in a statistics video changes the rules about rounding. The video walks through how to solve for sample size when you are given the error, z score, and standard deviation. It...

Have you ever wondered about the proportion of ducks it would take to equal one bear's weight? (It's 423.) The video walks through how to solve for sample size when you already know the confidence, error, and proportion. It also graphs...

If your sample size is small and your standard deviation is high, your results mean nothing. The video explains how to solve for sample size, assuming you are given the confidence, standard deviation, and error rate.

This lesson looks at what effects changing the standard deviation, confidence level, and/or sample size have on the width of a confidence interval. Includes downloadable study guide with exercises - guide also covers other topics. [11:26]

This lesson will explain sampling error and sample size. It is 4 of 4 in the series titled "Sampling Error and Sample Size."

This lesson will explain sampling error and sample size. It is 2 of 4 in the series titled "Sampling Error and Sample Size."

This lesson will explain sampling error and sample size. It is 3 of 4 in the series titled "Sampling Error and Sample Size."