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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?
indicate whether the following statement is true or falsea if the hypothesis hsub0betasub10 is rejectedthen it can be
what is the minimum sample size n required to estimate p with 95 confidence if the desired margin of error d0.08? the
Use this information to find the probability that an HRO officer selected from the group surveyed had problems with either employee absenteeism or employee turnover.
Assuming a standard deviation of 5 minutes and a simple random sample of 50 persons who filled out the long form, what is the probability that their average time for completion of the form was more than 45 minutes?
Explain why the sequence is important. What might happen if the hypothesis test is performed before the researcher has decided on the significance level?
Federated South Insurance Company has developed a new screening program for selecting new sales agents. Given the expected improvement, what is the probability that 19 or more reach their minimum sales goals
jim is in the 23rd percentile rank and jessica is in the 59th percentile rank. the variable is age and not at all
A firm offers routine physical examinations as part of a health service program for its employees. The exams showed that 8% of the employees needed corrective shoes, 15% needed major dental work, and 3% needed both corrective shoes and major denta..
according to runzheimer international a typical business traveler spends an average of 281 per day in chicago. this
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month.
We have no idea Regarding the shape of the population distribution. What is the probability that the mean fee for a sample of 30 customers was less than $125?
At the .05 level of significance, is there evidence that that the proportion of delayed Southwest Airlines departures from Phoenix in January 2008 is greater than 25%? State the decision in terms of the problem.
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