QUESTION 1

A new display panel to lower alert times for air traffic controllers about possible collisions has been developed. It is hoped that the new alert time will be faster. To test the new panel 15 air traffic controllers were tested using a simulation. The mean alert time from the sample was 6.94 seconds with a standard deviation of 1.165 seconds. Construct a 98% confidence interval for the mean alert time with the new panel.

(Round your final answer to 2 decimal places)

• What was your lower limit?
• What was your upper limit?

QUESTION 2

In a random sample of 400 drivers eighteen years and older, 198 of them said that they texted while driving. Construct a 95% confidence interval to estimate the proportion of people who text while driving.

(Round your final answer to 3 decimal places).

• What was your Lower Limit?
• What was your Upper Limit?

QUESTION 3

A company was interested in knowing the amount of time that their employees spent each day on social media websites. A sample of 44 employees showed a sample mean of 1.82 hours with a standard deviation of 0.324 hours. Develop a 94% confidence interval for the population mean number of hours spent on social media.

(Round your final answer to 2 decimal places.)

• What was your Lower Limit?
• What was your Upper Limit?