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A study was conducted at a major north-eastern American medical centre regarding blood cholesterol levels and heart-attack incidents. A total of 28 heart-attack patients had their cholesterol levels measured two days and four days after the attack. The units of measurement are milligrams per decilitre (mg/dL). The data are given below.
Investigate whether there is evidence that the mean cholesterol level two days after a heart attack is different from that four days after a heart attack.
1. State the model behind the appropriate t-test, and assess those assumptions for which suf?cient information has been provided. (You are given that your assessment will not reveal any problems with the model and that the t-test is appropriate.)
2. Clearly state the appropriate null hypothesis and carry out the t-test
3. If it is concluded that there is evidence of a difference between the mean cholesterol level two days after a heart attack and that four days after a heart attack, obtain a 95% con?dence interval for this difference. Explain in your own words how the con?dence interval should be interpreted.
This week, you have learned about how to use Cronbach's alpha as a measure of scale reliability. In this Application, you will calculate Cronbach's alpha for provided data. To p
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Problem 1 . Let X 0 ;X 1 ;X 2 . . . be a Markov chain with state space f1; 2g and transition probabilities given as follows: p 11 = 0:3; p 12 = 0:7; p 21 = 0:5; p 22 = 0:5:
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You have the following limited information upon which to base your decision as to which is the better of two alternative funding arrangements: Alternative 1 is to arrange fu
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