Posted by **Yo** on Tuesday, February 28, 2012 at 10:03pm.

A traffic engineer plans to estimate the average number of cars that pass through an intersection each day. Based on previous studies the standard deviation is believed to be 52 cars. She wants to estimate the mean to within ± 10 cars with 90 percent confidence. The needed sample size for n is:

## Answer This Question

## Related Questions

- statistics - The number of cars sold annually by used car salespeople is ...
- maths - the police officer also gathered data on the speedsx, in kilometers per ...
- Calculus - Transportation engineers use traffic flow data to design the timing ...
- Probability and Statistics - The major would like to estimate the mean number of...
- statistics - Consider the average available for all hotel rooms from the ...
- BUSSINESS STATISTICS - Consider the average available for all hotel rooms from ...
- Ap calc - A traffic engineer monitors the rate at which cars enter a freeway ...
- AP Calculus AB - A traffic engineer monitors the rate at which cars enter a ...
- Statistics - Country Insurance wants to estimate the cost of damage to cars due ...
- stats - The number of cars sold annually by used car salespeople is normally ...

More Related Questions