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In northern Europe, there are two species of flycatcher, the collared flycatcher and the pied flycatcher, that sometimes hybridize (i.e., a male from one species mates with a female from the other). Researchers investigated the sex of the offspring of such matings to test a pattern found in other birds - namely, that female hybrids are more likely to die before hatching than are male hybrids. The researchers found that of 26 hybrid offspring who made it to hatching, 16 were male. This compared with 72 males in 145 "purebred" offspring of matings between members of the same species. Is the proportion of males and females different in the purebred offspring than in the hybrid offspring? Do the appropriate hypothesis test.
A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute. A sample of 40 users had an average pulse rate of 98 beats per minute. Find the 95% confidence interv..
What is the null hypothesis? Use a = 0.05 .
Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05). Test the same claim by using the test statistics method ( Z or T test).
Medical tests were conducted to learn about drug-resistant tuberculosis. Of 142 cases tested in NJ, 9 were found to be drug-resistant. Of 268 cases tested in Tx, 5 were found to be drug-resistant.
For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
Relatively speaking, who performed better on the test, you, with an 86, or your friend? Why?
what are the basic characteristics of a normal distribution and the normal
describe in words and statistical terms the relationship between the number of years in education and corresponding
as we all know correlation does not imply causation. on other words if x and y are correlated it doesnt necessarily
questionc1-tinternetgdpco2cellularfertilityliteracyalgeria0.656.0930.32.858.3argentina10.0811.323.819.32.496.9australia3
the workers in a large meat packing plant earn annual incomes with mean 30000 and standard deviation of 9000. a labor
What information is provided by the numeral value of the Pearson correlation? What is the major distinction between the Pearson and Spear man correlations?
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