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In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one week period. Assume the population standard deviation is 1.8 hours. If the sample mean is 9 hours, then the 95% confidence interval is?
What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
For a recent year, the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.
Doctors nationally believe that 68% of a certain type of operation are successful. In a particular hospital 47 of these operations were observed and 37 of them were successful. At a = 0.05 is this hospital's success rate different from the nationa..
Determine the distributions given below represent a probability distribution. Justify your answer.
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
If circuit switching is utilized, how many user can this access link support?
A power of 0.2203 can be interpreted to mean there is a 22.03% chance of selecting a sample whose sample mean is larger than 166.3 lb.
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
A computer password consists of four characters. The characters can be one of the 26 letters of the alphabet. Each character may be used more than once.
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.
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