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Question: A news article by Reuters on October 6, 1998, reported:
In a new study, Dr. Matti Uhari and colleagues at the University of Oulu in Finland randomly gave 857 healthy children in daycare centers xylitol in syrup, gum, or a lozenge form, or a placebo gum or syrup in five doses per day for 3 months. According to a report in the October issue of the journal Pediatrics [Vol. 102, pp. 879-884, 971-972, 974-975], the incidence of ear infections was reduced by 40% in children given xylitol chewing gum, 30% in those given syrup and 20% in those given lozenges when compared to children given a placebo.
a. Is this an observational study or a randomized experiment? Explain.
b. What are the explanatory and response variables?
c. Are confounding variables likely to be a problem in this study? Explain.
The following exercises involve constructing definitions:- Construct lexical definitions for "capital" and "depression," and indicate two different meanings for each.
suppose that you are a researcher testing a new drug that might cure aids. in making a decision about whether to
Run a Monte Carlo simulation 1000 trials for the following distribution. Determine the mean and standard deviation of the simulated distribution.
an insurance company is reviewing its current policy rates. when originally setting the rates they believed that the
What classical techniques flourished under early Christian patronage? Please use specific examples.
The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score of 533 drops the seminar and is replaced by a student with a score of 765.
Comment briefly on the profitability and volatility of Gerald's business - Interpret the meaning of your interval, in simple terms understandable by the Mayor.
What factors might cause the company to order a larger or smaller amount than the EOQ?
Based on information, compute the following: Percentage (or portion) of children who watch television less than 6.5 hours a week.
Are the residuals from such a regression independent? Is there a difference in model fit and independence of residuals when using infant death rate as a response variable?
Comment on the graphical comparison of the estimates obtained with the two automatically selected spans in Problem 13 to the estimate obtained in Problems 5 and 6 using Friedman's method with cross-validation span and an appropriate value for the ..
A travel agency believes that the number of people who sign up for tours to Hawaii during the Christmas-New Year's holiday season is an approximately normally.
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