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The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
If you select a random sample of 100 sessions, what is the probability that the sample mean is between 7.8 and 8.2 minutes?
Find the prediction equation for the price of a laptop using rating and features. What is the value of the residual standard deviation?
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
Examine the two standard deviations. What do these indicate about the range of benefits enjoyed by the two groups?
Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
The probabilities of low, medium and high compliance are 0.3, 0.4, and 0.3, respectively
The percentages of cones sales for chocolate, strawberry, and vanilla, are 75%, 60%, and 40%, respectively. For a randomly selected sale, define the following events:
He will then compare the season batting averages of group A (those with ballet training) and group B (those without ballet training) by comparing the mean of group A with the mean of group B.
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 42 days.
Assume the least squares equation is Y' = 10 + 20X. What does the value of 20 indicate?
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