Confidence interval for the true population proportion
What is the approximate width of a 90% confidence interval for the true population proportion if there are 12 successes in a sample of 25?
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Oxnard Beneficial Insurance desires to estimate the cost of damage to cars due to accidents. The standard deviation of the cost is estimated at $200. They want to estimate the mean cost using a 95% confidence interval within ± $10. What is
A financial institution wishes to determine the mean balances owed by its credit card customers. The population standard deviation is estimated to be $300. If a 99 percent confidence interval is used and an interval of ± $75 is desired, how
A university wants to determine the average distance that commuter students travel to get to class with an error of ±3 miles and 90 percent confidence. What sample size would be needed, assuming that distances are normally distributed with
One lens consists of a focal length of +15.0cm. A second lens of focal length +20.0cm is positioned in contact with the first lens. Determine the equivalent focal length of the combination of lenses?
Determine the length of a box in which the difference among an electron's first and second allowed energies is around 1.20 x 10^-19 J?
A highway inspector needs an determine of the mean weight of trucks crossing a bridge on the Interstate highway system. She selects a random sample of 49 trucks and finds a mean of 15.8 tons with a sample standard deviation of 3.85 tons. The 90 pe
For the sharpest image, light from the distant point source makes as small a spot on the film as possible. Determine the optimum size of the hole for a camera in which the film is around17 cm from the pinhole?
Every Hunter prefers fraction 1/k of stag to the hare, but prefers hare to any smaller fraction of stage, where k is integer with m < k < n. Determine Nash Equilibria of the model.
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