Aim: Why is sample size so important in psychological research? Do Now: Please write out your Do Now on a slip of paper-to be collected! In an experiment to find out if ginseng increases IQ scores, IQ scores would be The independent variable A control variable An extraneous variable The dependent variable Homework: -Research Project due on Friday, October 23 (+5 if submitted on or before October 16) -Unit 2 vocabulary quiz on Thursday, October 22

M & M color distribution Aim: Why is sample size so important in psychological research? M & M color distribution You will be calculating the percentage of each color in a fun size m & m bag You will first calculate your own, then you will pair up with someone else in the group, and finally, you will add up as a group, and then we will add up as a class Don’t eat your m&m’s until after you have calculated the amount in your bag!

Step 1: Calculate amount in your single bag Aim: Why is sample size so important in psychological research? Step 1: Calculate amount in your single bag

Aim: Why is sample size so important in psychological research? Step 2: Partners: add up the amounts of yourself and your partner (trio if necessary)

Aim: Why is sample size so important in psychological research? Group: add up the amounts of you and your partner, with the amount that the other set of partners in your group has

We will now add up the amounts of each group Aim: Why is sample size so important in psychological research? We will now add up the amounts of each group

Aim: Why is sample size so important in psychological research? 10% 30% 10% 10% 20% 20%

Aim: Why is sample size so important in psychological research? Reflection Questions As the amount of M&Ms in your sample increased (from single bag to all of the M&Ms in the class) what happened to how the percentages compared to those of the factory production? Based upon your answer to #1, were you surprised by the result? Explain why or why not. Explain why sample size is important for psychological research.