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Antacids
A researcher wants to compare the performance of three types of antacid in volunteers suffering from acid reflux disease. Because men and women may react differently to this medication, the subjects are split into two groups, by sex. Subjects in each group are randomly assigned to take one of the antacids or to take a sugar pill made to look the same. The subjects will rate their level of discomfort 30 minutes after eating.
a) What kind of design is this?
b) The experiment uses volunteers rather than a random sample of all people suffering from acid reflux disease. Does this make the results invalid? Explain.
c) How may the use of the placebo confound this experiment? Explain.
A certain component is critical to the operation of an electrical system and must be replaced immediately upon failure. If the mean lifetime of this type of component is 100 hours and its standard deviation is 30 hours, how many of the components ..
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
All welders in a factory begin as apprentices. Every year the performance of each apprentice is reviewed. Past records indicate that after each review, 10% of the apprentices are promoted to professional welder
a certain brand of flood lamps has a lifetime that has a normal distribution with a mean of 3750 hours and a standard
Give a 95% confidence interval for the average amount of copper in the "population" of tons mined. Also give a 90% confidence interval and a 99% confidence interval for the average amount of copper per ton.
Assignment 1: Industry Report & Annotated Bibliography DETAILS Getting some understanding of the industry you might enter when you graduate is really important now to help shape your decision-making over the next few years.
Construct a 90% confidence interval to estimate the difference of (average number of gallons sold on weekdays - average number of gallons sold on weekends). Assume the population standard deviations are the same for both weekdays and weekends.
It is important for a woman to know if she is pregnant so that she can discontinue any activities, medications, exposure to toxins at work, smoking, or alcohol consumption that could be potentially harmful to the baby.
a hot topic of debate is whether the legal driving age should be raised to eighteen. from a random sample of 400
North Carolina State University looked at the factors that affect the success of students in a required chemical engineering course. Students must get a C or better in the course in order to continue as chemical engineering majors.
The principal randomly selected six students to take an aptitude test. Their scores were: 76.5 85.2 77.9 83.6 71.9 88.6. Determine a 90% confidence interval for the mean score for all students.
The membership for the club this year isobserved to be 14 freshman, 19 sophomores, 51 Juniors and 16Seniors. At 95% level of confidence, test the advisors belief..
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