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The western blot assay is a blood test for the presence of HIV. It has been found that this test sometimes gives false positive results for HIV. A medical researcher claims that the rate of false positives 2%. A recent study of 300 randomly selected US blood donors who do not have HIV found that 3 received a false positive test result. Test the researcher's claim of a 2% false positive rate at the a = 0.05 level. What can you conclude?
Consider babies born in the "normal" range of 37 - 43 weeks gestational age. What is the probability that the birth weight of a randomly selected baby of this type:
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked" large" and shrimp that weigh less than 0.47 ounces each into packages marked "small"; the remainder are packed in "medium" size packages.
Approval rating of 48% within a margin of error of 3%. Construct a confidence interval for the population proportion (p) of adults who approve of the candidate.
In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course.
Same survey showed that average length of time each store was in business in 6 years, with standard deviation of 2.5 years. Which is more variable, number of magazines or number of years?
In a perfectly symmmetrical distribution: a) the range equals the interquartile range b) the interquartile range equals the mean c) the median equals the mean d) the variance equals the standard deviation
Company are interested in how a new spaghetti sauce made from green tomatoes (and green in color) will compare to their traditional red spaghetti sauce. They are worried that the green color will adversely affect the tastiness scores.
The post anesthesia care area (recovery room) at St. Luke's Hospital in Maumee, Ohio was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25.
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
For a disease such as pancreatic cancer, which is highly fatal and of short duration:
A rental agent claims that the mean monthly rent,u, for apartments on the east side of town is less than$725 . A random sample of 13 monthly rents for apartments on the east side has a mean of$714
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