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The standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha fetoprotein. Using the test 80% of Down's syndrome cases can be identified while 5% of normals are detected as positives.
What is the sensitivity and specificity of the test? Suppose that 1 out of 500 infants are born with Down's syndrome.
what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 percent reliability.
Calculate and plot t he new supply schedule and indicate the new equilibrium price and quantity on your diagram
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
The probability of getting a promotion and a raise is 0.25. What is the probability of getting a raise.
An advantage of the permutation test over the t test for a difference in means is that - distribution interval or a bootstrap percentile interval
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Determine the probability in big class that both sections are covered? Only one section? Neither section? Determine the expected number of sections covered?
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
In your environment (business or personal), please give an application of exponential smoothing and why you would use this technique.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
If you were using the relative frequency of an event to estimate the probablility of the event, would it be better to use 100 trials or 400 trials according to the law of large numbers?
Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?
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