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A study published in the Archives of General Psychiatry in March 2001 examined the impact of depression on a patient s ability to survive cardiac disease. Researchers identified 450 people with cardiac disease, evaluated them for depression, and followed the group for 4 years. Of the 361 patients with no depression, 67 died. Of the 89 patients with minor or major depression, 26 died. Among people who suffer from cardiac disease, are depressed patients more likely to die than nondepressed ones?
a) What kind of design was used to collect these data?
b) Write appropriate hypotheses.
c) Are the assumptions and conditions necessary for inference satisfied?
d) Test the hypothesis and state your conclusion.
e) Explain in this context what your P-value means.
f) If your conclusion is actually incorrect, which type of error did you commit?
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
The probability that a student passes a written test for a private pilot's license is 0.75. What is the probability that a student will fail the test on the first attempt and pass it on the second attempt?
one of the cards from an ordinary deck of 52 cards is lost. what is the probability that a random card drawn from this
If the probability that she dies in the coming year is 0.001, what is the expected gain for the insurance company?
question 1 explain and describea the difference between population mean and sample mean.b the concept of estimation
What would the insurance company have to charge per policy-holder to break even? (i.e., what the premium would have to be in order to have an expected profit of zero.) Round to the nearest dollar.
Assume that two marbles are drawn without replacement from a box with 1 blue, 3 white, 2 green, and 2 red marbles. Find the probability of the indicated result.
Assume the null hypothesis is that μ = 50 and that the graph shown below is the sampling distribution of the mean (M). Would a sample value of M= 60 be significant in a two-tailed test at the .05 level? Roughly what value of M would be needed to b..
a. If the airbag activates at a deceleration of 12 mph/s or more, Iacocca would get hurt. What is the probability of his being hurt in this demon- stration? b. What is the mean deceleration at airbag activation moment? c. What is the standard devi..
The amount of time ships spend at the Philadelphia dockyard follows an exponential distribution and the average time spent in the dockyard is 3.1 days.
consider two components whose lifetimes x and y are independent and exponentially distributed with parameters lambdax
if the distribution of the measure of a random variable is not a normal distribution what implications might that fact
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