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The average time between infection with the AIDS virus and developing AIDS has been estimated to be 8 years with a standard deviation of about 2 years. Approximately what fraction of people develop AIDS within 4 years of infection? Assume that the distribution of time between infection with the AIDS virus and developing AIDS is symmetrical, bell-shaped. Please choose the answer that is closest to your calculations.
Find a 95% confidence interval for the true proportion of registered voters in each political party who checked "Yes" on the Presidential Election Campaign Fund question.
Determine whether the above information describes a probability distribution. If it does not, explain why. If it does, find its mean.
A store has determined that 25% of all sales are credit sales. A random sample of 75 sales is selected. What is the probability that the sample proportion will be:
Define the role of a capital market both from a firm's and from an investor's perspective. How is price determined for a security?
What is your research question? What is the null hypothesis for your question? What research design would align with this question?
At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml.
The average value observed was 1.2 mg. If the sample variance is 0.04 mg, compute a 99% confidence interval for the mean nicotine content.
1.a library determines that its books are returned on time 90 of the time. if 450 books are checked out what is the
you want to know if theres an association between college students spring break destinations and what year theyre in.
A random sample of 36 bearings is selected. What is the probability that the average diameter of these selected bearings will be between 34.95 and 35.18 mm?
Using a random sample of 100 business meetings, the researchers found that the average meeting in this sample started 4 minutes late and the standard deviation.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
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