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Unformatted text preview: cards?
Answer: 1/26 (1 chance in 26), because there is 1/2 chance of drawing a red card and 1
chance in 13 of drawing a nine. Therefore, 1/2 x 1/13 = 1/26 or 1 chance in 26 of
drawing a red nine.
• The Rule of Addition: The chance of an event occurring when that event can occur two
or more different ways is equal to the sum of the probabilities of each individual event.
Question: If 2 coins are tossed, what is the chance that the toss will yield 2 unmatched
coins (1 head & 1 tail)?
Answer: 1/2 (1 chance in 2) because the combination of 2 unmatched coins can come
about in 2 ways: Result A (coin #1 heads, coin #2 tails) as well as Result B (coin #1 tails,
coin #2 heads). Therefore (1/2 x 1/2) + (1/2 x 1/2) = 1/2, or the chance of Result A plus
the chance of Result B.
Paired Coins and Genetics
Using paired coins, in fact, mimics genetics closely. Each coin can serve as the model for a
gamete during fertilization.
When you toss two coins, there are three possible outcomes:
• 2 heads
• 2 tails
• 1 head, 1 tail Biol 302, Fall 2013
Determining the Chi-square Value
The Chi-square test is a statistical test that makes a comparison between the data collected in an
experiment versus the data...
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