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The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites born in 1900 and 33.0 years for nonwhites. Suppose that you randomly survey death records for people born in 1900 in a certain county. Of the 124 whites, the mean life span was 45.3 years with a standard deviation of 12.7 years. Of the 82 nonwhites, the mean life span was 34.1 years with a standard deviation of 15.6 years. Conduct a hypothesis test to see if the mean life spans in the county were the same for whites and nonwhites.
At a pre-conceived α = 0.05, what is your:
What is the conclusion of a test of level alpha=0.01, if we assume (incorreclty) that the hemoglobin level after the program is independent of the hemoglobin level before the program? Assume that the two populations are normally distributed with e..
Explain the logic of what you have done to a person who is unfamiliar with the analysis of variance.
suppose a manufactuirng company make a certain item. the time to produce each item is normally distributed around a
Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10.
annual maximum wind speed gusts have been modeled as both a type i gumbel and type ii largest extreme value. if the
The mean number of books each professor has. How many professors must the anthropologist sample to obtain an average accurate to within 14 books per professor?
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Mean income of $30,000and a standard deviation of $3,000. What is the income that separates the top 25% from the lower 75% of the incomes?
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
A local TV network wants to run an informal survey of individuals who exit from a local voting station to ascertain early results on a proposal to raise funds to move the city-owned historical museum to a new location. How might the network sampl..
Sample mean of 190.7 days and the population standard deviation of 54.2 days. Estimate the true mean population of the growing season with a 95% confidence.
a persons level of blood glucose and diabetes are closely related. let x be a random variable measured in milligrams of
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