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A cohort study of coffee drinking and anxiety was conducted at a university campus. There were a total of 30,000 freshmen who participated. 10,000 were coffee drinkers and 20,000 were not. Of the coffee drinkers, 500 developed anxiety during the 4 year follow-up period. Of the non-coffee drinkers, 200 developed anxiety during the same time period. Assume that no one in the population died or was lost during the follow-up period. Calculate the population risk difference using the given data. The numeric value of the population risk difference is...
a. 1.3 (per 100)
b. 2.7 (per 100)
c. 3.3 (per 100)
d. None of the above
Assume men's weights are normally distributed w/ a mean of 172 lb. and a s.d. of 29lb.
Find the Difference Between Two Measures of Intelligence
We use the observation vector Y = Y(n) = [Y1 ··· Yn]' to estimate X = X21. Find the LMSE estimate L (Y(n)) = (n)Y(n). Graph the mean square error e∗L(n) as a function of the number of observations n for φ0 ∈ {0.1, 0.5, 0.9}. Interpret your results...
Given a normal distribution of data, we know from the Empirical Rule that in between 2 standard deviations from the mean
A consumer group claims that the mean running time for a certain type of flashlight battery is not the same as the manufacturer's claims. Determine the null and alternative hypotheses for the test described.
the time it takes a ski patroller to respond to an accident call has an exponential distribution with an average
Suppose you are given a grant to run a controlled experiment. Explain how you would structure the experiment in order to estimate the casual effect of hours on sat.
more genetics. in problem 33 we learned that for some diseases such as sickle cell anemia an individual will get the
Assume that a sample is drawn and z(α/2) = 1.65 and σ = 35. Answer the following questions. (A) If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size?
A mean of 400 labour hours and a standard deviation of 100 labour hours. What is the probability that the bridge gets constructed between 350 and 450 hours?
Use a 1% level of significance to test the claim that the distribution of first nonzero digits in the account file does not follow Benford's Law.
assume that the population of heights of male college students is approximately normally distributed with mean m of
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