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Twenty-two volunteers at a cold research institute caught a cold after having been exposed to various cold viruses. A random sample of 10 of these volunteers was given tablets containing 1 gram of VItamin C four times a day. The control group, consiting of the remaining 12 volunteers, was given a placebo tablets that look the same as the Vitamin C tablets. The length of time the cold lasted was recorded.
Using the p value method, test if Vitamin C reduces the average time to recovery.
a sample of 30 cookies is taken to test the claim that each cookie contains an average of at least 9 chocolate chips.
A researcher wanted to invetigate whether there is a significant difference in the average age of instructors, assistant professors, assocated professors and full professors at a university. The faculty was selected at random and their ages were r..
Assuming the manufacturer's claim is true, what is the probability the consumer group's sample has a mean life of 52 or fewer months?
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
question consider the following three events based on a class of kindergarten students.event a nbsp student 1 has the
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
The company has evidence that its line produces %0.9 of noncorforming items. What is the probability that an item selected for inspection is classified as defective?
historically, only 5% of the gear boxes have such flaws. what is the probability that hooper's sample contains no gear boxes with manufacturing flaws ?
a chemical engineer is interested in determining whether a 1 certain trace impurity is present in a product. an
1 two researchers are interested in examining the relationship between level of education and level of volunteerism
Nationwide, GMAT scores in a particular year had an average of 528 with an SD of 112 and the scores roughly followed a normal curve. If a student scored 600 on the exam, approximately what percentage of test-takers scored below this student?
A mean of 54 and a standard deviation of 5; the N(54, 5) distribution. What is the relative frequency of classical CDs with a playing time of X of 59 minutes?
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