Chapter 9: Q. 9.12 (page 515)
Assume the -value is . What type of test is this? Draw the picture of the -value.
Short Answer
The indispensable thesis shows that the test is right- tagged.
Chapter 9: Q. 9.12 (page 515)
Assume the -value is . What type of test is this? Draw the picture of the -value.
The indispensable thesis shows that the test is right- tagged.
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Get started for freeOver 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.
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. At a significance level of a = 0.05, what is the correct conclusion?
a. There is enough evidence to conclude that the mean number of hours is more than 4.75
b. There is enough evidence to conclude that the mean number of hours is more than 4.5
c. There is not enough evidence to conclude that the mean number of hours is more than 4.5
d. There is not enough evidence to conclude that the mean number of hours is more than 4.75
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening night midnight showing of the latest Harry Potter movie. She surveys 84 of her students and finds that 11 of them attended the midnight showing. At a 1% level of significance, an appropriate conclusion is:
a. There is insufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is less than 20%.
b. There is sufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is more than 20%.
c. There is sufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is less than 20%.
d. There is insufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is at least 20%.
The mean throwing distance of a football for Marco, a high school freshman quarterback, is yards, with a standard deviation of two yards. The team coach tells Marco to adjust his grip to get more distance. The coach records the distances for throws. For the throws, Marco’s mean distance was yards. The coach thought the different grip helped Marco throw farther than yards. Conduct a hypothesis test using a preset . Assume the throw distances for footballs are normal.
First, determine what type of test this is, set up the hypothesis test, find the-value, sketch the graph, and state your conclusion.
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?
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