Chapter 9: Q. 39 (page 538)
What should you do if
When a equals p-value, the null hypothesis should not be rejected.
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Over the past few decades, public health officials have examined the link between weight concerns and teen girls' smoking. Researchers surveyed a group of 273 randomly selected teen girls living in Massachusetts (between 12 and 15 years old). After four years the girls were surveyed again. Sixty-three said they smoked to stay thin. Is there good evidence that more than thirty percent of the teen girls smoke to stay thin?
After conducting the test, your decision and conclusion are
a. Reject H0: There is sufficient evidence to conclude that more than 30% of teen girls smoke to stay thin.
b. Do not reject H0: There is not sufficient evidence to conclude that less than 30% of teen girls smoke to stay thin.
c. Do not reject H0: There is not sufficient evidence to conclude that more than 30% of teen girls smoke to stay thin.
d. Reject H0: There is sufficient evidence to conclude that less than 30% of teen girls smoke to stay thin.
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.
We want to test if it takes fewer than minutes to teach a lesson plan. State the null and alternative hypotheses. Fill in the correct symbol for the null and alternative hypotheses.
a.
b.
Sixty-eight percent of online courses taught at community colleges nationwide were taught by full-time faculty. To test ifalso represents California’s percent for full-time faculty teaching the online classes, Long Beach City College (LBCC) in California, was randomly selected for comparison. In the same year,of the online courses LBCC offered were taught by full-time faculty. Conduct a hypothesis test to determine if represents California. NOTE: For more accurate results, use more California community colleges and this past year's data
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
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