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An epidemiologist says that "randomization does not exclude confounding . . . confounding is very likely if information is collected-as it should be-on a sufficient number of baseline characteristics. . . ." Do you agree or disagree? Discuss briefly. Notes. "Baseline characteristics" are characteristics of subjects measured at the beginning of the study, i.e., just before randomization. The quote, slightly edited, is from Victora et al (2004).
suppose a loaf of bread cost 1.00 in 1984 and 1.80 in 2004. what is the bread price index in 2004 using 1984 as the
For a portion of the 2004 season, the shooting records of the 29 teams in the NBA showed the probability of scoring two points by making a field goal was .44, and probability of scoring three points by making a three point shot was 0.34. I
a car company conducted a study to understand the relationship between age groups and drivers primary vehicles. their
Your task is to identify a business problem which can be solved by one of the following techniques: Decision theory, regression, forecasting, inventory and linear programming.
If Q is an orthogonal matrix, so that QTQ = I, prove that det Q equals +1 or -1. What kind of parallelepiped is formed from the rows (or columns) of an orthogonal matrix Q?
The following data were obtained from an independent measures research study comparing three treatment conditions. Use an ANOVA with alpha=.05 to determine whether there are any significant mean differences among the treatments.
the u.s. post office is interested in estimating the mean weight of packages shipped using the overnight service. they
A researcher is interested in the relationship between caffeine consumption and activity level for elementary school children. A sample of 20 children is obtained and the children are separated into two roughly equivalent groups.
In a Little League baseball game, team A s pitcher throws a strike 50% of the time and a ball 50% of the time, successive pitches are independent of one another, and the pitcher never hits a batter. Knowing this, team B s manager has instructed th..
Is this hardware retailer's sales significantly different from all retailers in the chain at p= .05? Are they significantly different at p= .01? Calculate a .95 confidence interval for the data in problem.
1.an experiment compares yields for six different types of alfalfa. each type was planted in four different plots. the
The Gallup organization contracts 2871 male university graduates who have a white collar job and asks whether or not they had received a raise at work during the past 4 months. What is the population of the study?
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