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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.
Calculate the annual depreciation expense for each year of the machine's life (estimated at 5 years or 20,000 hours, with a salvage value of $75,000). During the machine's 5-year life its hourly usage was: 3,000; 4,000; 5,000; 5,000; and 3,000 hou..
Gogan Company manufactures and sells two products: Basic and Deluxe. Monthly sales, CM ratios, and the CM per unit for the two products are shown below: Prepare a contribution format income statement for the company as a whole. Compute the overall b..
company had processed chemical bh at a cost of 70000. this chemical can be sold now for 82000 or can be processed more
tammy acquired an automobile for 20000 on july 1 2010. she used the automobile partially for business purposes during
the balance sheet contains the major sections a-k listed below. a listing of balance sheet accounts follows.a.current
1.the inventory systems that uses the merchandise inventory account as an active account is called?a. periodic
stratford company distributes a lightweight lawn chair that sells for 80 per unit. variable expenses are 40.00 per unit
During that month, 21,250 units were produced. Budgeted activity for the month had been 20,900 units. What is the actual cost per unit for indirect materials?
Prepare a pro forma balance sheet for the upcoming fiscal year. Company X's current balance sheet, submitted at the end of their fiscal year, September 30, 2015, is displayed below.
carter corporation applies manufacturing overhead on the basis of machine-hours. at the beginning of the most recent
Montclair Company is considering a project that will require a $500,000 loan. It presently has total liabilities of $220,000, and total assets of $610,000.
verhague corporations net cash provided by operating activities was 84000 its net income was 61000 its capital
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