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Chapter 9: Q. 17 (page 537)
The power of a test is.What is the probability of a Type II error?
Type II error is the test has a power of.
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In , Life Magazine reported that the year-old mother of three worked, on average, an hour week. Recently,
many groups have been studying whether or not the women's movement has, in fact, resulted in an increase in the average
work week for women (combining employment and at-home work). Suppose a study was done to determine if the mean
work week has increased. women were surveyed with the following results. The sample mean wasthe sample
standard deviation was ten. Does it appear that the mean work week has increased for women at the role="math" localid="1650381098713" level?
The student academic group on a college campus claims that freshman students study at least hours per day, on average. One Introduction to Statistics class was skeptical. The class took a random sample of freshman students and found a mean study time of minutes with a standard deviation of minutes. At level, is the student academic group’s claim correct?
Previously, an organization reported that teenagers spent 4.5 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 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test.
The null and alternative hypotheses are:
Sixty-eight percent of online courses taught at community colleges nationwide were taught by full-time faculty. To test if 68% also 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, 34 of the 44 online courses LBCC offered were taught by full-time faculty. Conduct a hypothesis test to determine if 68% represents California. NOTE: For more accurate results, use more California community colleges and this past year's data.
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and finds that the sample mean is 29.4 with a standard deviation of 2.1. Conduct a hypothesis test.
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