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Chapter 9: Q. 6 (page 537)
A sociologist claims the probability that a person picked at random in Times Square in New York City is visiting the area isYou want to test to see if the claim is correct. State the null and that alternative hypothesis.
is the null hypothesis.
is the alternative hypothesis.
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Previously, an organization reported that teenagers spent hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was hours with a sample standard deviation of . Conduct a hypothesis test, the error is:
a. to conclude that the current mean hours per week is higher than , when in fact, it is higher
b. to conclude that the current mean hours per week is higher than , when in fact, it is the same
c. to conclude that the mean hours per week currently is , when in fact, it is higher
d. to conclude that the mean hours per week currently is no higher than , when in fact, it is not higher
On a state driver's test, about pass the test on the first try. We want to test if more than pass on the first try. Fill in the correct symbol for the null and alternative hypotheses.
a.
b.
You are performing a hypothesis test of a single population mean using a Student鈥檚 -distribution. The data are not from a simple random sample. Can you accurately perform the hypothesis test?
A group of doctors is deciding whether or not to perform an operation. Suppose the null hypothesis, , is: the surgical procedure will go well. Which is the error with the greater consequence?
La Leche League International reports that the mean age of weaning a child from breastfeeding is age four to five worldwide. In America, most nursing mothers wean their children much earlier. Suppose a random survey is conducted of U.S. mothers who recently weaned their children. The mean weaning age was nine monthsrole="math" localid="1649394170256" with a standard deviation of months. Conduct a hypothesis test to determine if the mean weaning age in the U.S. is less than four years old.
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