PSYC 211: Understanding sampling

You will see a series of pairs of frequency histograms. Your task is to determine whether these two samples differ (i.e., are drawn from populations with different medians). You have two tasks - are the two samples different (which you indicate by checking the "Different?" check box) and how big the difference is. It will cost you $1 per individual sampled. Good guesses of the difference (within 20% of the real population value) will earn you $250 and correctly indicating whether the two samples are different or not will earn you $50.

Enter your sample size in the lower left textbox and click the Sample button.

After viewing the sample, check or uncheck the "Different?" check box (as appropriate), and put your guess of the population difference in medians into the right textbox and click the Guess button. After clicking Guess, you will be told whether you are correct, your bankroll will be credited if appropriate, and the next distribution will appear.

After you are done, either print out the final screen and turn it in or print it to a pdf (if you know how) and email it to the TA. In order to earn credit for the assignment, you must finish the task with a bankroll of $1500. If you finish with $2000, then you can earn an extra credit point. NOTE!!! You must complete all 10 data sets for full credit!