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The time to relapse, in months, for patients on two treatments for lung cancer is compared using the following log normal regression model: Y =1n(X) =2+0.5Z+2W, where W has a standard normal distribution and Z = 1 if treatment A and 0 if treatment B.
(a) Compare the survival probabilities of the two treatments at 1, 2, and 5 years.
(b) Repeat the calculations if W has a standard logistic distribution. Compare your results with part (a).
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
A random sample of 56 people measured accuracy w/ positive errors representing watches that are ahead of the correct time and negative rep. those behind the time.
Using the formula, Elk]:'u: 2? , what would be the expected or theoretical value for the mean of the sampling distribution of the mean? How does it compare to t
Determine the value of z so that the area under the standard normal curve
Design and diagram a randomized a comparative experiment to help make a decision.
Assume the results come from a random sample and use a 5% significance level.
An experiment to study the relationship between x = time spent exercising (minutes) and y = amount of oxygen consumed during the exercise period resulted in the following summary statistics. Estimate the slop and y intercept of the population regre..
A student throws a deck of cards into the air and then counts the number of cards that, after landing, are showing the face of the card
Calculate the population variance, s2, and the variances of each of the sampling populations. What is to be expected? How do the results match your expectations
the number of ships to arrive at a harbor on any given day is a random variable represented by x. the probability
A nationwide standardized test taken by high school juniors and seniors may or may not measure academic potential, but we can nonetheless examine the relationship bewteen scores on such test and performance in college.
Consider the values 0,121,132,123,145,151,119,133,134,130,250. Are the values 0 and 250 declared outliers using the classic outlier detection rule?
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