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One test that people who wish to donate blood must undergo is a test of iron level. Individuals with insuficient iron levels are not permitted to donate blood. A preliminary inexpensive screening test is initially performed for iron level. If an individual fails this test, he or she is given a more expensive second test of iron level. Suppose that 30% of the people who fail the first test pass the second test and are allowed to donate blood. A doctor is searching for a blood donor among those whil failed the first test. She randomly selects individuals from those who failed the first test.
What is the probability that the doctor will find a suitable donor on the
1) Second selection?
2) fourth selection?
3) tenth selection?
when is it appropriate to use an anova? what is the key piece of information you must know in order to
Let μ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for μ of $8.46 to $9.86 using the normal distributio..
1.some researchers have conjectured that stem-pitting disease in peach-tree seedlings might be controlled through weed
Describe a political poll or survey. Analyze the number of people who participated in the sample compared to the number in the population.
What is the p-value and compute a 95% CI for the difference in means between the two groups?
a student has 40 chance of getting a scholarship. consider a group of 10 students.a. what is the probability that
The heights were measured for nine supermodels. They have a mean of 67.1 and a standard deviation of 2.3 in. Use the traditional method and a 0.01 significance level to test the claim that supermodels have heights with a mean that is greater than ..
Compute the variance and standard deviation
A recent study indicated that 29% of the 100 women over age 55 in the study were widows. If no estimate of the sample proportion is available how large should the sample be?
The following data shows the packages gathered for delivery for ten days and the proportion of packages received not delivered to the customers at expected time.
what is the probability that a random variable has a value between 1.75 and 7.35 if that random variable has a uniform
A normal distribution has a mean of µ = 100 with σ = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 90 and X = 120?
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