In what circumstance might the Port Authority-or anyone else-take a migratory bird without a permit and not be sanctioned?

Eagle Outfitters is a chain of stores specializing in outdoor apparel and camping gear. They are considering a promotion that involves mailing discount coupons to all their credit card customers. This promotion will be considered a success if more than 10% of those receiving the coupons use them. Before going national with the promotion, coupons were sent to a sample of 100 credit card customers.

Use $\alpha= .05$ to conduct your hypothesis test. Should Eagle go national with the promotion?

Eagle Outfitters is a chain of stores specializing in outdoor apparel and camping gear. They are considering a promotion that involves mailing discount coupons to all their credit card customers. This promotion will be considered a success if more than 10% of those receiving the coupons use them. Before going national with the promotion, coupons were sent to a sample of 100 credit card customers.

The file Eagle contains the sample data. Develop a point estimate of the population proportion.

Ten years ago $53 \%$ of American families owned stocks or stock funds. Sample data collected by the Investment Company Institute indicate that the percentage is now $46 \%$.

a. Develop appropriate hypotheses such that rejection of $H_0$ will support the conclusion that a smaller proportion of American families own stocks or stock funds in 2012 than 10 years ago.

Ten years ago, $53 \%$ of American families owned stocks or stock funds. Sample data collected by the Investment Company Institute indicate that the percentage is now $46 \%$.

b. Assume the Investment Company Institute, sampled 300 American families to estimate that the percent owning stocks or stock funds was $46 \%$ in 2012. What is the $p$-value for your hypothesis test?

Ten years ago, $53 \%$ of American families owned stocks or stock funds. Sample data collected by the Investment Company Institute indicate that the percentage is now $46 \%$.

c. At $\alpha=.01$, what is your conclusion?

Population Mobility. What percentage of the population live in their state of birth? According to the U.S. Census Bureau's American Community Survey, the figure ranges from $25 \%$ in Nevada to $78.7 \%$ in Louisiana. The average percentage across all states and the District of Columbia is $57.7 \%$. The data in the file Homestate are consistent with the findings in the American Community Survey. The data represent a random sample of 120 Arkansas residents and for a random sample of 180 Virginia residents.

c. Estimate the proportion of stay-at-home residents in Virginia. Does this proportion differ significantly from the mean proportion for all states? Use $\alpha=.05$.

According to the Centers for Disease Control, the probability that a live birth will be of twins in the United States is 0.016. What is the probability that a live birth will not be of twins?

Population Mobility. What percentage of the population live in their state of birth? According to the U.S. Census Bureau's American Community Survey, the figure ranges from $25 \%$ in Nevada to $78.7 \%$ in Louisiana. The average percentage across all states and the District of Columbia is $57.7 \%$. The data in the file Homestate are consistent with the findings in the American Community Survey. The data represent a random sample of 120 Arkansas residents and for a random sample of 180 Virginia residents.

a. Formulate hypotheses that can be used to determine whether the percentage of stayat-home residents in the two states differs from the overall average of $57.7 \%$.

Population Mobility. What percentage of the population live in their state of birth? According to the U.S. Census Bureau's American Community Survey, the figure ranges from $25 \%$ in Nevada to $78.7 \%$ in Louisiana. The average percentage across all states and the District of Columbia is $57.7 \%$. The data in the file Homestate are consistent with the findings in the American Community Survey. The data represent a random sample of 120 Arkansas residents and for a random sample of 180 Virginia residents.

b. Estimate the proportion of stay-at-home residents in Arkansas. Does this proportion differ significantly from the mean proportion for all states? Use $\alpha=.05$.

The national mean annual salary for a school administrator is $\$ 90,000$ a year. A school official took a sample of 25 school administrators in the state of Ohio to learn about salaries in that state to see if they differed from the national average.

b. The sample data for 25 Ohio administrators is contained in the DATAfile named Administrator. What is the $p$-value for your hypothesis test in the previous part?

The national mean annual salary for a school administrator is $\$ 90,000$ a year. A school official took a sample of 25 school administrators in the state of Ohio to learn about salaries in that state to see if they differed from the national average.

d. Repeat the preceding hypothesis test using the critical value approach.

Population Mobility. What percentage of the population live in their state of birth? According to the U.S. Census Bureau's American Community Survey, the figure ranges from $25 \%$ in Nevada to $78.7 \%$ in Louisiana. The average percentage across all states and the District of Columbia is $57.7 \%$. The data in the file Homestate are consistent with the findings in the American Community Survey. The data represent a random sample of 120 Arkansas residents and for a random sample of 180 Virginia residents.

d. Would you expect the proportion of stay-at-home residents to be higher in Virginia than in Arkansas? Support your conclusion with the results obtained in parts (b) and $(\mathrm{c})$.

Residents of Lake Caliopa, Minnesota, began noticing an unusually high number of lung ailments among the local population. Several concerned citizens pooled their resources and commissioned a study to compare the frequency of these health conditions in Lake Caliopa with national averages. The study concluded that residents of Lake Caliopa experienced four to seven times the rate of frequency of asthma, bronchitis, and emphysema as the population nationwide. During the study period, citizens began expressing concerns about the large volume of smog emitted by the Cotton Design apparel manufacturing plant on the outskirts of town. The plant had a production facility two miles east of town beside the Tawakoni River and employed seventy full-time workers. Just downstream on the Tawakoni River, the city of Lake Caliopa operated a public water works facility, which supplied all city residents with water.

The Minnesota Pollution Control Agency required Cotton Design to install new equipment to control air and water pollution. Later, citizens sued Cotton Design for various respiratory ailments allegedly caused or compounded by smog from Cotton Design's factory. Using the information presented in the chapter, answer the question.

Under the common law, what would each plaintiff be required to identify in order to be given relief by the court?