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Chapter 5: Q 2.3. (page 305)
Explain why . Then use the general addition rule to find.
The likelihood of and the occurrence A or B
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Simulation blunders Explain what鈥檚 wrong with each of the following simulation designs.
(a) A roulette wheel has colored slots鈥� red, black, and green. To simulate one spin of the wheel, let numbers to represent red, to
represent black, and to represent green.
(b) About of U.S. adults are left-handed. To simulate randomly selecting one adult at a time until you find a left-hander, use two digits. Let to represent being left-handed and to represent being right-handed. Move across a row in Table D, two digits at a time, skipping any numbers that have already appeared, until you find a number between and 10. Record the number of people selected.
If I toss a fair coin five times and the outcomes are , then the probability that tails appears on the next toss is (a) 0.5. (b) less than (c) greater than (d) (e) Exercises to refer to the following setting. A basketball player makes of her shots from the field during the season.
Crawl before you walk (3.2) At what age do babies learn to crawl? Does it take longer to learn in the winter, when babies are often bundled in clothes that
restrict their movement? Perhaps there might even be an association between babies鈥� crawling age and the average temperature during the month they first try to crawl (around six months after birth). Data were collected from parents who brought their babies to the University of Denver Infant Study Center to participate in one of a number of studies. Parents reported the birth month and the age at which their child was first able to creep or crawl a distance of four feet within one minute. Information was obtained on infants ( boys and girls). Crawling age is given in weeks, and average temperature (in 掳F) is given for the month that is six months after the birth month. Analyze the relationship between average crawling age and average temperature. What do you conclude about when babies learn to crawl?
Box of chocolates According to Forrest Gump, 鈥淟ife is like a box of chocolates. You never know what you鈥檙e gonna get.鈥� Suppose a candy maker offers a
special 鈥淕ump box鈥� with chocolate candies that look the same. In fact, of the candies have soft centers and 6 have hard centers. Choose of the
candies from a Gump box at random.
(a) Draw a tree diagram that shows the sample space of this chance process.
(b) Find the probability that one of the chocolates has a soft center and the other one doesn鈥檛.
Sampling senators The two-way table below describes the members of the U.S Senate in a recent year. Male Female Democrats Republicans
(a) Who are the individuals? What variables are being measured?
(b) If we select a U.S. senator at random, what鈥檚 the probability that we choose
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