Web Activities

Click on the following links. Please note these will open in a new window.

Just how random is flipping a coin?

Go to the following website: http://justflipacoin.com/

At this website you can flip a coin as many times as you would like. Flip the coin 10 times and record how many times it comes up heads. Repeat this (flipping 10 times and recording the number of heads) at least two more times. Assuming the website is using fair coin, was how many times did the coin come up heads 5 times? Why wouldn’t the coin come up heads 5 times each time you flip it 10 times?

Learn about and the operational measures as well as the Narcissistic Personality Inventory

As we learned in Chapter 1, many variables of interest to psychologists are not physical. For example, to measure narcissism you must ask an individual questions and infer their personality indirectly. Thus, we must operationalize narcissism as scoring high on a valid personality measure. This allows for people to also learn about their own personalities.

For example, go to following website:  http://personality-testing.info/tests/NPI/

To learn about your own narcissism, answer all forty pairs of statements. The survey should take most people 5–10 min to complete. After you complete the survey, you will learn about your personality as well as how most people score on narcissism.

Learn about simple random samples using this online calculator

Students are often surprised that you can estimate presidential elections (with a margin of error of 3%) with only a bit over 1,000 respondents. While the accuracy of these polls require representative samples, it is the small size of the samples that shocks students. This website (http://www.custominsight.com/articles/random-sample-calculator.asp) allows you to change the size of the population and determine how large your sample size needs to be in order to have a 95% confidence estimate in the population parameter. Go to the website and change the sample sizes to see how the size of the population actually has little to do with the size of the population needed for an accurate estimate.