In which of the following scenarios would it be appropriate

In which of the following scenarios would it be appropriate to construct a 95% confidence interval for the parameter of interest?

Select all that apply.

Select one or more:

A state safety official wants to estimate the proportion of licensed cars in NC that have worn tires. Using the state car registration records, he randomly selects 100 cars. He inspects each car and finds that 12% of them have worn tires.

A state congressman wants to know the proportion of NC voters who support higher taxes to pay for state parks. He randomly selects five parks and talked with people at the parks. Of 200 voters found in the parks, 183 supported higher taxes to pay for state parks.

A police officer wants to know the proportion of licensed drivers who have had a speeding ticket within the last five years. He randomly selects 30 drivers from a database of all licensed drivers, and checks their records. He finds that 30% of the people had speeding tickets within the last five years.

A politician wants to know the proportion of registered women voters that are registered with the Democratic Party. He looks at voter registration, randomly selects 100 women, and sees that 56% of women are registered with the Democratic Party.

Solution

Answer: All of them