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There is a new diagnostic test for a disease that occurs in about 0.05% of the population. The test is not perfect. Its sensitivity is 99% and its specificity is 97%. A person is chosen at random from this population and the tests indicate that this person has the disease. What is the probability that the person has the disease?
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportions of children are overweight?
if the temperature at which a certain compound melts is a random variable with mean value 120 degree celsius and
What is the approximate minimum percentage of data in any frequency distribution that lies within 3 standard deviations of its mean?
a concern to public health officials is whether a concentration of lead in the paint of older homes may have an effect
What is the idea behind linear regression? What is it? Why do it? What are some limitations of linear regression?
In the radar system of Example 8.4, show that the ROC in Figure 8.2 is the result of a Neyman-Pearson test. That is, show that the Neyman-Pearson test is a threshold test with acceptance set A0 = {X ≤ x0}. How is x0 related to the false alarm pro..
Which chart indicates the trend in forecast values as a particular decision variable is varied
Test the hypothesis of no differences for average payback period (years) necessary to justify solar heating systems for residences.
What is the population under consideration and what are the two variables under consideration and find the conditional distributions of birth region.
In a random sample of 35 trading days, the volume of a particular stock is recorded to determine whether the mean volume of the stock changed from its 2007 value of 35.14 million shares.
Consider the following two-stage stratified sampling plan. In the first stage, the population is stratified into H strata and kh clusters are selected
A research firm observes that men are twice as likely as women to watch the Super Bowl on television. Does this information represent descriptive statistics or inferential statistics? Why?
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