1. How are confidence intervals useful in statistical analysis? What is the difference between confidence intervals for means and confidence intervals for proportions and percentages?

2. The Police-Public Community Survey asks respondents who have been stopped by the police while driving a vehicle how many officers were on the scene during the stop. Stopped drivers who were female (N = 2033) reported a mean pf 1.14 (s = .36) officers. Construct a 95% confidence interval around this sample mean. Interpret this interval in words.

3. The General Social Survey asks respondents whether they keep a gun in their homes. In this survey, 34% of respondents (N = 1281) said they have at least one firearm. Construct a 99% confidence interval around this sample value. Interpret the interval in words.

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