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Coal is carried from a mine in West Virginia to a power plant in Georgia in hopper cars on a long train. The automatic loader is set to put 75 tons of coal into each car. The actual weights of coal loaded into each car is known to follow a distribution with a mean of 75 tons and a standard deviation of 1.7 tons. In a random sample of 32 cars, you are interested in the probability that the mean of that sample is less than 74.5 tons of coal.
What is the probability that the sample mean coal weight is less than 74.5 tons?
a) 0.0244
b) 0.0485
c) 0.3860
d) 0.9756
e) None of the above are correct.
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In the spring of 1987 Gary Hart, the leading Democratic presidential candidate, told the news media that he was more than willing to have his private life scrutinized carefully.
What would be the null hypothesis for this statement? ... here it is: Compare the average price (target) based on condition.
What proportion of the population would be expected to have IQs of 110 or higher? Answer the following questions for 250 first-grade students.
Analyze the data and explain which one would be the better medication for both a sore throat and a fever. If damage to the fuselage was far more common, explain why he made this recommendation.
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HIV found that 3 received a false positive test result. Test the researcher's claim of a 2% false positive rate at the a = 0.05 level. What can you conclude?
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