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A standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha-feroprotein. Using this test 80% of Down's syndrome cases can be identified at birth, while 5% of normals are detected as positive.
a. What is the sensitivity and specificity of the test?
b. Assume that 1/500 births have this genetic condition. What is the percentage of births who test positive using this test will actually have the condition?
In a clinical study of an allergy drug, 115 of the 204 subjects reported experiencing significant relief from their symptoms. At the 0.01 significance level, test the claim that more than half of all those using the drug experience relief.
Utilizing the .05 level, do the results support the psychologists' theory. A psychologist theorized where people can hear better when they have just eaten a large meal.
Given that X1 is in the model, does X2 contribute to predicting the dependent variable at the .05 significance level?
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.) Use the five steps of hypothesis testing and explain your findings.
Find out the correlation among the two variables in the regression. A simple linear regression produced the following computer output.
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
Computing the probability values using normal distribution - what proportion have SAT scores greater than 550?
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
Survey of 16 tax returns reports families with incomes between $75,000 and 100,000 have on average $8,562 in Standard Deductions with the standard deviation of $1,800.
If circuit switching is utilized, how many user can this access link support?
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