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In a randomized comparative experiment on the effect of calcium in the diet on blood pressure, researchers divided 54 healthy white males at random into two groups. One group received calcium; the other, a placebo. At the beginning of the study, the researchers measured many variables on the subjects. The paper reporting the study gives x = 114.9 and s = 9.3 for the seated systolic blood pressure of the 27 members of the placebo group.
1. Give a 95% confidence interval for the mean blood pressure in the population from which the subjects were recruited..
2. What conditions for the population and the study design are required by the procedure you used in (a)? Which of these conditions are important for the validity of the procedure in this case?
the class average on a statistics test is 67 with a standard deviation of 10. what minimum grade must a student obtain
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protein is one of the most misunderstood nutrients. what do you think is the most important function of protein? were
Which research method is most suitable for studying factors that influence behavioral change over time?
Parental employment and early child care have a psychological effect on many individuals today. Based on the information in the text and other resources, how might this impact the children in our society?
What are the alternatives to oil
One day, Alice received a statement that shows a debit of $1,000,000 from her account. On inquiring, she was told that the bank manager,Bob, transferred the money out of Alice's account and into an account of his own in an offshore bank.
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An oil engine works on the ideal Diesel cycle. The overall compression ratio is 11:1 and constant pressure energy addition ceases at 10% of the stroke. Intake conditions are 96 kN/m2 and 18°C. The engine uses 0.05 m3 of air/s. If ? = 1.4, determine. ..
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The City Manager has contacted you regarding the following issues concerning various governmental departments and external stakeholders:
A base stationcellular communication systems lossless antenna has a maximum gain of 16 dB (above isotropic) at 1,900 MHz. Assuming the input power to the antenna is 8 watts, what is the maximum radiated power density (in watts/cm2) at a distance of 1..
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