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Aimed at finding substantial earnings decreases, a random sample of 23 firms with substantial earnings decreases showed that the mean return on assets 3 years previously was 0.058 and the sample standard deviation was 0.055. An independent random sample of 23 firms without substantial earnings decreases showed a mean return of 0.146 and a standard deviation 0.058 for the same period. Assume that the two population distributions are normal with equal standard deviations. Test, at the 5% level, the null hypothesis that the population mean returns on assets are the same against the alternative that the true mean is higher for firms without substantial earnings decreases.
Community college spends each year. If she wishes to be 90% confident, how large a sample is necessary if the standard deviation is known to be $80?
An account invested in a money market fund grew from $73,329.23 to $73,627.26 in a month. What was the interest rate to the nearest tenth?
does random sampling guarantee that the sample chosen will be representative of the
usa today ran a report about a unc poll of 1248 adults from the southern u.s. it was reported that 8 of those surveyed
five students ann betty clint douglas and edward are rated equaly qualified for admission to law school ahead of other
What are the most important concepts you have learned from conduct one-and two-sample tests of hypotheses? What would you recommend to your management/leadership based conduct one-and two-sample tests of hypotheses?
between 4 and 9 pm cars place orders at the drive through window of the tiki takeout restaurant once every 5
What is the probability that more than 25% of the business travelers say that the reason for their most recent business trip was an internal company visit?
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
businessweek conducted a survey of graduates from 30 top mba programs businessweek september 22 2003. on the basis of
Using Poisson Distribution with u= 4 tumors per eye, determine probability that there are at least four occurrences of tumors per eye?
Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1.
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