Title: Mini Project 2 jamovi Version
Course: PSYC 301 Statistical Methods in Psychol

This is for folks who have jamovi on the computer they have access to. If you don't have jamovi, click here to do the assignment.

Here are the instructions that you had earlier.

For Mini Project 2, we will be testing a hypothetical situation of determining if a company makes fair dice. The specific kind of dice we are talking about are 20 sided dice, numbered 1 to 20, commonly used in role-playing games like Dungeons & Dragons. In most of these games getting higher numbers on a roll leads to a better outcome for the player.

Imagine you are a person who runs game conventions and you want to give each attendee a 20-sided die in their goodie bag. Of course, if you are like me, you care that they are good dice and you locate a nicely-priced supplier of bulk dice in a variety of festive colors. They arrive by the Postal Service in boxes of 50 dice each. You want to do a basic test of them to make sure they are fair. A fair die will deliver higher numbers (from 11 through 20) as often as lower numbers (from 1 through 10).  You take one box, unopened to a suitably large room with a flat open floor and dump the dice out from a couple of feet in the air. They tumble out wildly bouncing and skittering across the floor. You don't touch them except to pick up each die after writing down the number on a piece of paper, then tossing it back into the box. By the end of this you have confirmed you did indeed get 50 dice and you have the numbers recorded for each .

If you have jamovi, follow these steps:

1. Click on this link to download the jamovi (.omv) file.
2. Open that file in jamovi.
3. You'll see that you have a file with three columns
  1. Die Roll: the number rolled on each die
  2. High Low: a classification of that die roll as either low (1 to 10) or high (11 to 20)
  3. Color: the color of the die
4. Select the Analyses tab
5. Select the Frequencies icon (5th icon over, looks like a waffle)
6. Select the first choice for One Sample Proportions Tests that is named 2 Outcomes Binomial test
7. Select High Low and click the arrow to move it to the right hand box.
8. Confirm the following:
  1. Values are counts is NOT checked
  2. Test value is 0.5 (change it to that if it is some other value)
  3. Hypothesis is marked for ≠ Test Value
  4. Confidence intervals is NOT checked
9. In the right hand pane of the window are the results of the Proportion Test (2 outcomes) and it tells you the following: The count and proportion for High and Low values and the probability for those proportions to be seen if the null hypothesis value of 0.5 is the basis for the distribution from which the data came. Note below the table is  the alternative hypothesis description using jamovi's terminology.
10. If that probability is 0.05 or less, then we can reject the null hypothesis that the dice are as likely to roll high as low. But, if that probability is greater than 0.05, then we retain the null hypothesis.
11. Keep this jamovi information up on screen, screen-shot it, or write it down.

At this point, click here return to the assignment to find the questions you need to answer.