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During construction of a large urban drainage canal, concrete samples were taken to ascertain that the concrete produced is consistent with specifications. According to the contract agreement, the materials engineer should be have 90% confidence that the estimate of the mean slump does not deviate from the specified value by more than 5 mm? From past experience, it has been found that the parameter of produced units is normally distributed with a variance of 12 mm. How many observations should be taken in a test sample?
fifteen people will be enrolled in a four-week foreign language course. on the first day the instructor gives the
Would it be reasonable to conclude that less than 5 percent of the employees are not able to pass the random drug test?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
question eighteen per cent of multinational companies provide an allowance for personal long-distance calls for
You calculate that their mean monthly rent is $613 and their standard deviation is $96. What are the degrees of freedom for a one-sample -statistic?
How could we rescreen for defective units from a population of 900 units and establish a 95% confidence that the whole 900 units are acceptable.? How many would we need to check out of the 900?
the manufacturer of the x-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before
a software developer is interested in finding what the best color theme should be for an engine diagnostic program for
What is the calculated t value? Are the mean test scores of these two groups significantly different at the .05 level?
u.s. bureau of the census data reveal the largest town in the state of oh has a population of one million families. the
How many ways are there of obtaining 10 patients expressing a preference for drug A. Repeat for 9 patients. 8 patients. ... 1, 0 patients. Tabulate your results.
Probability the second truck is available is .50, and the probability that both trucks are available is .30. What is the probability neither truck is available?
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