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Hypothesis Test for Identifying Psychiatric Disorders Are severe psychiatric disorders related to biological factors that can be physically observed? One study used x-ray computed tomography (CT) to collect data on brain volumes for a group of patients with obsessive-compulsive disorders and a control group of healthy persons. Sample results for volumes (in mL) follow for the right cordate (based on data from "Neuroanatomical Abnormalities in Obsessive-Compulsive Disorder Detected with Quantitative X-Ray Computed Tomography," by Luxenberg et al., American Journal of Psychiatry, Vol. 145, No. 9). Construct a 99% confidence interval estimate of the difference between the mean brain volume for the healthy control group and the mean brain volume for the obsessive-compulsive group. What does the confidence interval suggest about the difference between the two population means? Based on this result, does it seem that obsessive-compulsive disorders have a biological basis?
Control group: n 5 10, x 5 0.45, s 5 0.08Obsessive-compulsive patients: n 5 10, x 5 0.34, s 5 0.08
Calculate variance of a poisson random variable?
The Elixer Drug Company produces a drug from two ingredients. Each ingredient contains the same three antibiotics, in different proportions. One gram of ingredient 1 contributes 3 units, and 1 gram of ingredient 2 contributes 1 unit of antibiotic 1; ..
1. length of pregnancies the length of human pregnancies from conception to birth varies according to a distribution
How many cases of relays and capacitors should Harkin Electronics produce during that period? If your answer is in fractional units of cases that is acceptable - do not round to whole number of cases.
Identify sample, population, sampling frame (if applicable), and response rate (if applicable). Describe sampling technique (if applicable) or experimental design
Flybynight Airlines measured their numbers of lost bags in one month and found that they had lost 130 bags for 10,000 customers. If the average number of bags per customer is 1.3, how many errors per million opportunities (epmo) does this represent?
What is the average rating for all CBC movies? How about ABN movies and BBS movies and create a line graph of the monthly average ratings for CBC for the year
Analyze the survey sample you have selected for your group. The best way to do this will be to convene a meeting every week and discuss how you could apply analytical techniques covered in your classes so far on survey data.
Yoonie is a personnel manager in a large corporation. Each month she must review 16 of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of 1.2 hours...
Describe the error in the conclusion. Given: There is a linear correlation between the number of cigarettes smoked and the pulse rate. As the number of cigarettes increases the pulse rate increases. Conclusion: Cigarettes cause the pulse rate to incr..
Regression analysis techniques
A manufacturer of electronics kits has found
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