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In the following descriptions of a study, confounding is present. Describe the explanatory and confounding variable in the study and how the confounding may invalidate the conclusions of the study. Furthermore, suggest how you would change the study to eliminate the effect of the confounding variable.
a. A hospital introduces a new screening procedure to identify patients suffering from a stroke so that a new blood clot medication can be given to the patient during the crucial period of 12 hours after stroke begins. The procedure appears to be very successful because in the first year of its implementation there is a higher rate of total recovery by the patients in comparison to the rate in the previous year for patients admitted to the hospital.
b. A high school mathematics teacher is convinced that a new software program will improve math scores for students taking the SAT. As a method of evaluating her theory, she offers the students an opportunity to use the software on the school's computers during a 1-hour period after school. The teacher concludes the software is effective because the students using the software had significantly higher scores on the SAT than did the students who did not use the software.
From their findings, Amazon found that 30% of their customers who make a purchase also purchase an add-on product from that feature. Assuming this is true, use the binomial distribution table to determine the probability that in a random sample of..
Research question : At α = . 01, is degree of certainty independent of credits earned?
A CPA has selected and audited a sample of 100 accounts with a total book value of $1,000 and an audited value of $1,200. Using the mean-per-unit estimation technique, the estimated total audited value of the population is:
Develop a joint probability table for these data. If a student goes full time, determine the probability that school quality is first reason for selecting a school?
What is meant by the "sequential assembly of an experimental design"? Illustrate the sequential assembly of a three-factor central composite design
The monthly sales demand for a new product is uncertain, but it is considered to be adequately described by a normal random variable with mean 50,000 units and variance 100,000,000.
What is the Average Annual Investmentfor this machine?What is the ownership cost per hour?
A study was designed to compare variability of male and female diastolic blood pressure. The null hypothesis was that the population standard deviation were equal versus the alternative that they were not equal.
Monroe, Inc, is evaluating a project. The company uses 13.8 percent discount rate for this project. cost and cash flows are shown in the table.
engine capacity the engine in a 1957 chevrolet corvette has eight cylinders. each cylinder is a right cylinder with a
a. What is the difference between composition and coverage? b. What is Opportunity to See (OTS) and why is it central to media measurement?
Choose an American household at random and let the random variable X be the number of cars (including SUVs and light trucks) they own.
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