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Chapter 9: Q. 9.2 (page 507)
We want to test whether the mean height of eighth graders is inches. State the null and alternative hypotheses. Fill in the correct symbol for the null and alternative hypotheses.
a.
b.
a. Null hypotheses is equal to.
b. Alternative hypotheses is not equal to.
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Your statistics instructor claims that percent of the students who take her Elementary Statistics class go through life feeling more enriched. For some reason that she can't quite figure out, most people don't believe her. You decide to check this out on your own. You randomly survey of her past Elementary Statistics students and find that feel more enriched as a result of her class. Now, what do you think?
It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than seven hours of sleep per night, on average. A survey of LTCC Intermediate Algebra students generated a mean of hours with a standard deviation of hours. At a level of significance of , do LTCC Intermediate Algebra students get less than
seven hours of sleep per night, on average?
The error is not to reject that the mean number of hours of sleep LTCC students get per night is at least seven when,
in fact, the mean number of hours
a. is more than seven hours.
b. is at most seven hours.
c. is at least seven hours.
d. is less than seven hours.
Some of the following statements refer to the null hypothesis, some to the alternate hypothesis. State the null hypothesis, , and the alternative hypothesis. Ha, in terms of the appropriate parameter .
a. The mean number of years Americans work before retiring is .
b. At most 60% of Americans vote in presidential elections.
c. The mean starting salary for San Jose State University graduates is at least per year.
d. Twenty-nine percent of high school seniors get drunk each month.
e. Fewer than of adults ride the bus to work in Los Angeles.
f. The mean number of cars a person owns in her lifetime is not more than ten.
g. About half of Americans prefer to live away from cities, given the choice.
h. Europeans have a mean paid vacation each year of six weeks.
i. The chance of developing breast cancer is under for women.
j. Private universities' mean tuition cost is more than per year.
The US Department of Energy reported that 51.7% of homes were heated by natural gas. A random sample of 221 homes in Kentucky found that 115 were heated by natural gas. Does the evidence support the claim for Kentucky at the 伪 = 0.05 level in Kentucky? Are the results applicable across the country? Why?
A statistics instructor believes that fewer than of Evergreen Valley College (EVC) students attended the opening midnight showing of the latest Harry Potter movie. She surveys of her students and finds that 11 of them attended the midnight showing. The Type I error is to conclude that the percent of EVC students who attended is ________.
a. at least , when in fact, it is less than .
b. , when in fact, it is .
c. less than, when in fact, it is at least .
d. less than , when in fact, it is less than .
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