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Chapter 5: Q. T5.1 (page 357)
What is the probability that the person owns a Dodge or has four-wheel drive?
The correct option is :
d.
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Middle school values Researchers carried out a survey of fourth-, fifth-, and sixth-grade students in Michigan. Students were asked whether good grades, athletic ability, or being popular was most important to them. The two-way table summarizes the survey data.
Suppose we select one of these students at random.
Who鈥檚 pregnant? According to the Current Population Survey (CPS), 27%
of U.S. females are older than 55. The Centers for Disease Control and Prevention (CDC) report that 6% of all U.S. females are pregnant. Suppose that these results are accurate. If we randomly select a U.S. female, is P(pregnant and over 55) =? Why or why not?
Which of the following is a correct way to perform the simulation?
a. Let integers from represent making a free throw and represent missing a free throw. Generate random integers from. Count the number
of made free throws. Repeat this process many times.
b. Let integers from represent making a free throw and represent missing a free throw. Generate 50 random integers from 1 to 50 with no repeats
allowed. Count the number of made free throws. Repeat this process many times.
c. Let integers fromrepresent making a free throw and represent missing a free throw. Generate 50 random integers fromCount the number of made free throws. Repeat this process many times.
d. Let integers from localid="1653986588937" represent making a free throw and localid="1653986593808" represent missing a free throw. Generate 50 random integers from localid="1653986598680" with no repeats allowed. Count the number of made free throws. Repeat this process many times.
e. None of the above is correct.
In a class, there are girls and boys. If the teacher selects two students at random
to attend a party with the principal, what is the probability that the two students are the
same sex?
Brushing teeth, wasting water? A recent study reported that fewer than half of young adults turn off the water while brushing their teeth. Is the same true for teenagers? To find out, a group of statistics students asked an SRS of students at their school if they usually brush with the water off. In the sample, students said "Yes." The dotplot shows the results of taking SRSS of students from a population in which the true proportion who brush with the water off is .
a. Explain why the sample result (of the students said "Yes") does not give convincing evidence that fewer than half of the school's students brush their teeth with the water off.
b. Suppose instead that of the students in the class's sample had said "Yes." Explain why this result would give convincing evidence that fewer than of the school's students brush their teeth with the water off.
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