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Refer to the previous two exercises about MBTI and drinking.
a. The sample proportion who reported drinking alcohol frequently was 0.092. When this is the cutpoint for forming a classification table, sensitivity = 0.53 and specificity = 0.66. Explain what these mean.
b. Using (a), show that the sample proportion of correct classifications was 0.6
C. The concordance index c equals 0.658 for the model with the four main effects and the six interaction terms, 0.640 for the model with only the four main effect terms, and 0.568 for the model with only T/F as a predictor. According to this criterion, which model would you choose (i) if you want to maximize sample predictive power (ii) if you think model parsimony is important?
A. Determine the regression equation. B. Determine the estimated sales if 40 contacts are made.
To estimate p, we use the proportion p-hat in the sample who answer "Yes." Justify the use of a normal approximation and find the following probabilities.
A sample of 60 infants participated in a test of color preference
1. Consider an in?nite server queuing system in which customers arrive in accordance with a Poisson process with rate λ, and where the service distribution is exponential with rate μ. Let X(t) denote the number of customers in the system at time t. F..
A recent study reported that the prevalence of hyperlipidemia (defined as total cholesterol over 200) is 30% in children 2-6 years of age. If 12 children are analyzed,
an investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin
Let the number of chocolate drops in a certain type of cookie have a Poisson distribution. We want the probability that a cookie of t"his type contains at least two chocolate drops to be greater than 0.99. Find the smallest value that the mean of ..
An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from the pheromone under study and a control substance.
The J.O. supplies company buys calculators the probability of a defective calculator is 10%. If 100 calculators are selected at random, what is the expected number of defective?
Recognize and describe potential threats (up to 3) to internal validity.
which of the following would produce a standard error of 2 points? explain your response.n 25 scores from a population
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
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