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A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on the average, they spent 6.5 years on the job before being promoted. The standard deviation of the sample was 1.7 years. Construct a 95 percent confidence interval.
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random sample of 36 fish is taken from the tank.
The diameters of peaches in a certain orchard are normally distributed with a mean of 3.85 inches and a standard deviation of 0.42 inches. Show all work.
A burglar plans his crimes so carefully that the lengths of the burglary are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given burglary runs between 51.0 and 51.5 minutes.
Develop a point of the population standard deviation for life expectancy of VCRs.
All standard IQ test scores are normally distributed and are set up so that the mean score is 100. However, the standard deviation differs from test to test.
Tom works the night shift at a gas station on the edge of Champaign. One night he mixed 3 stale doughnuts in with 13 fresh doughnuts. That night 6 customers bought one doughnut each, selecting them at random. What is the probability that at least ..
Suppose that you are interested in determining the relation between the students average SAT scores [x] and their freshman GPA [y].
A new improved rocket launching system is being considered for short-range assault rockets. The requirement is that 80% of the rockets shall strike the target area at 800 meters. A sample of 36 experimental launches is made with 29 striking the ta..
Determine the special property of standard normal distribution, compared to other normal distributions?
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