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In a study of how depression may affect one s ability to survive a heart attack, the researchers reported the ages of the two groups they examined. The mean age of 2397 patients without cardiac disease was 69.8 years (SD = 8.7 years) while for the 450 patients with cardiac disease, the mean and standard deviation of the ages were 74.0 and 7.9, respectively.
a) Create a 95% confidence interval for the difference in mean ages of the two groups.
b) How might an age difference confound these research findings about the relationship between depression and ability to survive a heart attack?
The length of time to do a complete full service oil change at Speedy-Lube is normally distributed with a mean of 15.8 minutes and a standard deviation of 2.2 minutes
Calculate The Expected Value of X
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a normal distribution has a mean of 45 and an unknown standard deviation. which random variable value below could
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Find the sample proportion planning to vote for Candidate Y.- Calculate the standard error of the sample proportion.
or a Poisson process of rate λ, the Bernoulli arrival approximation assumes that in any very small interval of length ?, there is either 0 arrivals with probability 1-λ? or 1 arrival with probability λ?. Use this approximation to prove Theorem 10..
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Consider the sample data for plants A, B, C & D of the above company, which are tabulated in table 1. Test whether the four means are equal at the 5% level of significance
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