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CHARACTERIZING "FAST-ACTING" RAT POISON
The scientists at the ACME rat poison laboratories, who have been working non-stop to develop a new "fast-acting" formulation that will break the "thousand-second" barrier, appear to be on the verge of a breakthrough. Their target is a product that will kill rats within 1000 secs, on average, with a standard deviation of 125 secs. Experimental tests conducted in an affliated toxicology laboratory in which pel- lets were made with a newly developed formulation and administered to 64 rats (selected at random from an essentially identical popula- tion). The results showed an average "acting time," x¯ = 1028 secs. The ACME scientists, anxious to declare a breakthrough, were preparing to approach management immediately to argue that the observed ex- cess 28 secs, when compared to the stipulated standard deviation of 125 seconds, is "small and insigni?cant." The group statistician, in an attempt to present an objective, statistically-sound argument, recom- mended instead that a hypothesis test should ?rst be carried out to rule out the possibility that the mean "acting time" is still greater than 1000 secs. Assuming that the "acting time" measurements are normally distributed, carry out an appropriate hypothesis test and, at the signif- icance level of α = 0.05, make an informed recommendation regarding the tested rat poison's "acting time."
Explain the distribution of mean of samples of size 15.
Eighteen (18) people in a department of 162 are fully trained in CPR and AED. A person shows signs of a heart attack. Five (5) people respond. What is the probability that NO (0) person who responded is trained to treat the victim? (Show all of yo..
The weight of an egg produced by a certain breed of hen is normally distributed with mean 66.1 grams (g) and standard deviation 5.5 g. If cartons of such eggs can be considered to be SRSs of size 12 from the population of all eggs, what is the pro..
the respiratory rate per minute in newborns varies according to a distribution that is approximately normal with mean
Assume that a 2005 poll of 1000 American voters found that 76% of Republicans favored ending the tax on dividend income, as did 42% of Democrats and 54% of Independents.
Write probability statements relating hemline height, stock market prices, and "adven- turesomeness" that correspond to the following description of these relationships:
a mass of 46 grams of oxygen fill a weighted piston-cylinder device at 47kpa and 140degree c. the device is now cooled
Explanation on what is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient?
a manufacturing engineer is studying the dimensional variability of a particular component that is produced on three
If the campaign manager's claim is correct, what is the probability that the sample proportion would be no more than 0.49 for a sample of this size? Based on your answer to part (a), speculate on whether the campaign manager's claim might be mistak..
Bill calculates a linear correlation coefficient between two variable as 1.20. How would you interpret this?
Pearson Correlation cannot be used to identify non-linear relationships between two variables.
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