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Two new drugs were given to patients with hypertension. The first drug lowered the blood pressure of 16 patients an average of 11 points, with a standard deviation of 6 points. The second drug lowered the blood pressure of 20 other patients an average of 12 points, with a standard deviation of 8 points. Determine a 95% confidence interval for the difference in the mean reductions in blood pressure, assuming that the measurements are normally distributed with equal variances.
Use the Poisson Distribution the indicated probabilities in one year, there were 116 homicide deaths in Richmond VA. For a randomly selected day
A regression line for a certain set of data is found to be y = 14 + 9x. The mean of y , or y bar, is 27. A particular data point is (2,40). What is the total variation in this point?
classified ads in newspaper offered for sale several used cars of the same make and model. listed below are the ages of
Show that if Z1 and Z2 are independent standard normal random variables, then for all ρ (correlation), Z 1 and ρZ 1 +sqrt(1-ρ 2 )*Z 2 are standard normal with correlation ρ.
the inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard
q1. a recent study shows that 20 of all employees prefer their vacation time during march break. if a company
Modify the program ErgodicChain so that you can compute the basic quan- tities for the queueing example of Exercise 11.3.20. Interpret the mean recur- rence time for state 0.
of 20 rats in a cage 12 are males and 9 are infected with a virus that causes hemorrhagic fever. of the 12 male rats 7
in a survey of 100 business executives 60 per cent were male and 40 per cent were female. 70 per cent of the male
in an opinion survey a random sample of 1000 adults from the u.s.a. and 1000 adults from germany were asked whether
The appliance giant offers a replacement guarantee on kettles which malfunction within a certain time of the purchase, but due to financial constraints, can only afford a maximum of 5% replacements. What must the guarantee period be?
In a random survey of 226 self-employed individuals, 20 reported having had their tax returns audited by the IRS in the past year. Estimate the proportion of self- employed individuals nationwide who've been audited by the IRS in the past year. a)..
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