57 National Firearms Survey. The Harvard School of Public Health conducted a survey to determine the size and composition of privately held firearm stock in the United States.

In a representative household telephone survey of 2,770 adults, 26% reported that they own at least one gun ( Injury Prevention , Jan. 2007). The researchers want to estimate the true percentage of adults in the United States that own at least one gun.

a. Identify the population of interest to the researchers.

b. Identify the parameter of interest to the researchers.

c. Compute an estimate of the population parameter.

d. Form a 99% confidence interval around the estimate.

e. Interpret the confidence interval practically.

f. Explain the meaning of the phrase “99% confident.”