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Enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Here are approximate probabilities of positive and negative test results when the blood tested does and does not actually contain antibodies to HIV:
For example, the top left cell gives you the probability of getting a positive test given the antibodies are present (P(Test +|Antibodies present)).
Suppose that 1% of a large population carries antibodies to HIV in its blood.Draw a tree diagram with this information and use it to answer the following question.
What is the probability that the test is positive for a randomly chosen person from this population? Please use 4 decimal places
For the other 25 percent of the population, the drug has no effect on colds. If an individual tries the drug for a year and has 2 colds in that time, what is the probability that the drug is beneficial to that individual?
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart.
Compute the confidence intervals of your data from the Week 4 Learning Team paper. Based on your confidence intervals.
q1. a manufacturing company measures the weight of boxes before shipping them to the customers. if the box weights have
Under what circumstances must a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests?
Assuming Tt = 761 + 5t that a multiplicative model can be used to describe the building permit data, generate a forecast for the number of building permits that you expect will be granted in June of 2006.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .25 hours?
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
Calculate the standard error of estimate for the regression equation.
A well-established power-drink dispensing machine is programmed to dispense an average of 2.02 liters into a container labled"2 liters". Actual quantities are known to be normally distributed with a standard deviation of 0.015 liters. What is the ..
Crete a 90% confidence interval for mean Secchi dish measurement.
Construct a 95 percent confidence interval for the population proportion of positive drug tests. May you assume that this is a normal distribution? Explain why.
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