A dice program should roll 1 to 6. Which range keeps every roll legal?

• 0 to 9
• 1 to 6
• 1 to 100

What is a random value in a program?

• A value the computer picks fresh on each run
• A value typed by the player
• A value that never changes

Two runs of a dice program must show the same number.

Circle one:   True   False

A game drops a star at a random x from 0 to 400 on a 400-wide screen. One day a star never appears. What is the likely cause?

• The range reaches the very edge, where the star hides
• The screen is too wide
• Stars are afraid of screens

You run a coin-flip program ten times and see heads every time. What should you conclude?

• The program is proven fair
• Short runs can look lopsided by chance
• Coins always land heads

You run the same program three times. What should you write down?

• What stayed the same and what changed
• Only the funniest run
• Nothing, memory is enough

A Treat-or-Trick program shows Trick below 5 and Treat at 5 or above, from 0 to 10. After a thousand runs each word appears about half the time. What does that tell you?

• The program is broken
• The words are misspelled
• The split sits near the middle of the range

A friend says one winning run proves a dice game is correct. What is wrong with that proof?

• Winning runs do not count
• One run cannot show the broken values chance never picked
• Dice games cannot be tested