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Table 5.15 describes results from a study in which subjects received a drug and the outcome measures whether the subject became incontinent (y = 1, yes; y = 0, no). The three explanatory variables are lower urinary tract variables that represent drug-induced physiological changes. a. Report the prediction equations when each predictor is used separately in logistic regressions.b. Try to fit a main-effects logistic regression model containing all three predictors. What does your software report for the effects and their standard errors? (The ML estimates are actually -∞ for x1 and x2 and ∞ for x3.)c. Use conditional logistic regression to find an exact P-value for testing H0: β3 = 0. [The exact distribution is degenerate, and neither ordinary ML or exact conditional ML works with these data. For alternative approaches, see articles by D. M. Potter (Statist. Med., 24: 693-708, 2005) and G. Heinze and M. Schemper (Statist. Med., 22: 1409-1419, 2002).]
Proportion nonconforming is 0.10. what is the probability of (1) 1 nonconforming unit in the sample (b) 1 or less (c) 2 or more?
Why is cumulative relative frequency distribution so much more informative that just relative frequency distribution? Use examples to explain these differences.
The percentage of physicians who are women is 27.2%. In a survey of physicians employed by a large university health system, 48 of 120 randomly selected physicians were women. Compute the test value.
The rate of return for one year (reported in percent) for a sample of 12 mutual funds 4.634 4.15 4.76 4.70 4.65 4.52 4.70 5.06 4.42 4.51 4.24 4.52. Using .05 significance level,
IQ scores but have been standardized so that complete sample has mean of M = 10 and standard deviation of s = 2. Compute mean and the standard deviation for the sample of n = 8 females and for sample of n = 8 males.
a normally distributed random variable y has std dev. 800. a random sample of 100 observations was taken from y and
at lido and frank mini food customers spend an average of 25 minutes selecting their groceries. the check out time
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
Suppose that he wishes to get out of the mine and that he does so by choosing one of the three doors uniformly at random and continues to do so until he is free. Find the generating function, the mean and the variance for the time it takes him to ..
consider a virus that is spread by transfusions of blood contaminated by the virus a person receiving contaminated
A random sample of 160 car crashes are selected and categorized by age. The are listed below. The age distribution of for the given categories is 18% for under 26, 39% for 26-45, 31% for 46-65, and 12% for over 65.
For a certain stock, the price of a call option is 7.80 and the price of the corresponding put option with the same strike price and expiration date is 1.50. Find the new price of the put option.
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