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Question: For each of the studies described, explain whether the study was an observational study or a randomized experiment.
a. A group of 100 students was randomly divided, with 50 assigned to receive vitamin C and the remaining 50 to receive a placebo, to determine whether vitamin C helps to prevent colds.
b. A random sample of patients who received a hip transplant operation at Stanford University Hospital during 2000 to 2010 will be followed for 10 years after their operation to determine the success (or failure) of the transplant.
c. Volunteers with high blood pressure were randomly divided into two groups. One group was taught to practice meditation and the other group was given a low-fat diet. After 8 weeks, reduction in blood pressure was compared for the two groups.
In your answer, you will need to demonstrate some understanding of the nature and extent of the 'problem' before applying your chosen sociological theory. You will need to use at least 8 authoritative sources (journal articles, textbooks, etc.)
let s be the event that a randomly chosen male age 18-24 is republican. let c be the event that a randomly chosen male
data on pull-off force pounds for connectors used in an automobile engine application are as follows 79.3 75.1 78.2
Find The probability of making exactly four sales, The probability of making no sales, The probability of making exactly two sales and The mean number of sales in the two-hour period.
Find a simple regression model that predicts time to fulfill an order based on value of the order. Interpret the estimated model coefficients.
Describe how you would attach identification numbers to the patient files; for example, how many digits (and which digits) would you use to indicate the first patient file?
the amount spent on their first visit is approximately normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for μ?
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.
The following table exhibits base salary data obtained from a survey of over 170 benchmark positions, including finance positions.
Change the last number in that set from 36 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
In Exercises 117 and 118, as well as many other situations, one has the pdf f(x) of X and wishes to know the pdf of y = h(X). Assume that h( ? ) is an invertible function, so that y= h(x) can be solved for x to yield x = k(y). Then it can be shown..
What would that evaluation be and what is the margin of error?
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