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Although the phenomenon is not well understood, it appears that people born during the winter months are slightly more likely to develop schizophrenia than people born at other times (Bradbury & Miller, 1985). The following hypothetical data represent a sample of 50 individuals diagnosed with schizophrenia and a sample of 100 people with no psychotic diagnosis. Each individual is also classified according to season in which he or she was born. Do the data indicate a significant relationship between schizophrenia and the season of birth? Test at the .05 level of significance.
Season of Birth
Summer
Fall
Winter
Spring
No disorder
27
26
23
28
Schizophrenia
8
9
17
12
Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
For a disease such as pancreatic cancer, which is highly fatal and of short duration:
The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with a mean of 3.2 pounds and a standard deviaition of 0.8 pound.
future electronics makes cd players. its research department found that the life of the laser beam device is normally
Find the discrete probability distribution for the random variable X and compute the corresponding mean and standard deviation.
Explain how the margin of error is reported in the article, and how and why the margin of error impacts the results of the study.
Suppose X is a random variable with mean u and variance sigma2, Calculate the mean vector and variance matrix of the random vector Y = (X,2+3X)?
question a researcher believes that the percentage of people who exercise in california is greater than the national
You are interested in investing, and are considering a portfolio comprised of the following two stocks. Their estimated returns under varying market conditions are provided:
A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. a) Provide a 95% confidence level for all the patients who are referred to the health center by the hospital.
Compute the relative dispersion (Coefficient of Variation) of each group and give us your thoughts on the dispersion. About 95% of all checked luggage on domestic flights weigh between what two values? How did you find this?
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
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