STAT
Rec_probability_au10

# A what is the chance that a randomly selected

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who have Twitter accounts also have Facebook accounts. a. What is the chance that a randomly selected teenager has both a Facebook account and a Twitter account? ANS___________ b. Explain why .40 x .10 = .04 is NOT the correct answer to part a. Use 10 words or less. 6. A researcher wants to know whether people are more likely to take carry-on luggage if they have connecting flights. Data on 210 passengers is shown below. Connecting flight Direct flight Total Carry-on luggage 80 40 120 No carry-on luggage 20 70 90 Total 100 110 210 Let CO = carry on; NCO = no carry on; CF = connecting flight; DF = direct flight. a. What probability is represented by 40/120 in this table? (This should be a marginal, conditional, or “and” probability. Do not use formulas.) ANS___________ b. What probability is represented by 40/110 in this table? (This should be a marginal, conditional, or “and” probability. Do not use formulas.)

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ANS___________ c. What probability is represented by 40/210 in this table? (This should be a marginal, conditional, or “and” probability. Do not use formulas.) ANS___________ d. Who is more likely to take carry on luggage, people on direct flights or people on connecting flights? Justify using probabilities and 10 words or less.
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