Chapter 5: Q. 106. (page 337)
If P(A) = 0.24, P(B) = 0.52, and A and B are independent events, what is P(A or B)?
a.
b.
c.
d.
e. The answer cannot be determined from the information given.
Short Answer
The required answer is
The correct option is
Chapter 5: Q. 106. (page 337)
If P(A) = 0.24, P(B) = 0.52, and A and B are independent events, what is P(A or B)?
a.
b.
c.
d.
e. The answer cannot be determined from the information given.
The required answer is
The correct option is
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Get started for freeButter side down Researchers at Manchester Metropolitan University in England
determined that if a piece of toast is dropped from a-foot-high table, the probability
that it lands butter side down is .
a. Explain what this probability means.
b. Suppose that the researchers dropped pieces of toast, and all of them landed butter
side down. Does that make it more likely that the next piece of toast will land with the
butter side up? Explain your answer.
Crawl before you walk (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’ crawling age and
the average temperature during the month they first try to crawl (around 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 feet within one minute. Information was obtained on infants. Crawling age is given in weeks, and average temperature (in degrees Fahrenheit) is
given for the month that is months after the birth month.
a. Make an appropriate graph to display the relationship between average temperature and
average crawling age. Describe what you see.
Some computer output from a least-squares regression analysis of the data is shown.
b. What is the equation of the least-squares regression line that describes the relationship
between average temperature and average crawling age? Define any variables that you
use.
c. Interpret the slope of the regression line.
d. Can we conclude that warmer temperatures months after babies are born causes them
to crawl sooner? Justify your answer.
Four-sided dice A four-sided die is a pyramid whose four faces are labeled
with the numbers and(see image). Imagine rolling two fair, four-sided dice and
recording the number that is showing at the base of each pyramid. For instance, you would
record a if the die landed as shown in the figure.
a. Give a probability model for this chance process.
b. Define event A as getting a sum of . Find P(A).
Suppose that a student is randomly selected from a large high school. The probability
that the student is a senior is The probability that the student has a driver’s license
is . If the probability that the student is a senior or has a driver’s license is ,
what is the probability that the student is a senior and has a driver’s license?
Temperature and hatching How is the hatching of water python eggs influenced by the temperature of a snake’s nest? Researchers randomly assigned newly laid eggs to one of three water temperatures: cold, neutral, or hot. Hot duplicates the extra warmth provided by the mother python, and cold duplicates the absence of the mother.
Suppose we select one of the eggs at random.
a. Given that the chosen egg was assigned to hot water, what is the probability that it hatched?
b. If the chosen egg hatched, what is the probability that it was not assigned to hot water?
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