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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
The same is true for only 60 of 300 female Engineering majors. Find a 90% confidence interval for the difference in proportions of men and women Engineering majors who got such jobs?
Assume that the average person in America weighs 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the weights collected on a sample of colleges students: 120, 105, 166, 170, 145, 14..
Suppose you were to cut up the directory and pull out one listing at random to contact.
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per micro-liter) is measured. The sample mean is 5.23. The population standard deviation for red blood cell counts is 0.54.
a mineral economist estimated that a particular mining venture had probability 0.4 of a 30 million loss probability 0.5
The price of XYZ Corporation stock is normally distributed all through the year with mean of $42.00 per share and a standard deviation of $2.25 per share. Suppose that the stock is traded 240 days out of the year.
a husband and wife ted and suzanne share a digital music player that has a feature that randomly selects which song to
the weights in pounds of discarded plastic from a sample of households summary statistics are n62 x1.911 s1.065 use a
In the basic economic order quantity (EOQ) model, if monthly demand is a constant 430 units, the order quantity is 144 (12 dozen), and the firm operates during fifty five-day weeks a year, the cycle time will be approximately?
Given the following data, calculate the EMV for each investment alternative. Which is best based on the EMVs you calculated?
if the risk of a certain disease for non-alcoholics is 7 and the relative risk for this disease in alcoholics versus
With 95% confidence, what is the margin of error (to 2 decimals)? What is the 95% confidence interval estimate of the population mean?
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