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An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed. If a sample of 16 bulbs has an average life of 50 hours and the population standard deviation is known to be 10 hours.
a) What is the 94% confidence interval for the population mean of all bulbs produced by the firm.
b) What is the 95% PREDICTION interval for the next bulb produced by the firm?
At 5 % level of significance, does this sample prove violation of the guideline that average patient muts pay no more than $250 out-of-pocket? Is this a close decision?
A person runs one mile to his house as fast as he can. It is equally likely that he will run at an average speed of 3 miles per hour, 6 miles per hour, and 9 miles per hour.
What is the margin of error for a 95% confidence interval for the difference of the two means (low capacity - high capacity)? (Answer to the nearest hundredth.)
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
Prepare a power curve for this decision rule
Perform a parametric analysis by assessing the fractional change in the probability of failure with respect to a small change in the mean and standard deviation of selected variable.
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
The store manager is under impression that his sales people do more business if they score higher on the social skills test which was administered this year. 5 victims were selected at random. Below, the results are X =test score, Y =weekly sales ..
The estimated miles per gallon ratings of a class of automobiles are normally distributed with a mean of 12.8 and a standard deviation of 3.2. What is the probability that one of these automobiles selected at random would get:
Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in.
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