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The quality-control manager at a light bulb factory needs to determine whether the mean life of a population of light bulbs is equal to 375 hours. A random sample of 64 light bulbs indicates a sample mean of 350 hours and a standard deviation of 100 hours. At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
Draw a scatter diagram and consider the correlation for the provided data. Do larger universities tend to have more property crime.
Is the z value positive or negative? Explain why it should be positive or negative.
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
For the following scores, find the (A) mean, (B) median, (C) sum of squared deviation (d) variance, and (e) standard deviation:
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
If desired confidence level is 95 percent, suitable critical value is?
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
Random samples of 25 observations were selected from each of 3 populations. For these data, SSTR= 120 and SSE = 216.
Find out the probability that at least one of the CD's is defective?
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
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.
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