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Find the probability that 15 light bulbs each having life time normally distributed with a mean of 3 months and a standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.
Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: rankings of the top ten best-selling authors
Assume a normal distribution for pH values. If a random sample of 10 readings in a vat is taken and the mean pH is computed, find each of the following?
What is the value of the population mean? What is the best estimate of the value?
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
An elevator has a uniform distribution ranging from 0 to 4 minutes. Find the mean and standard deviation of x, the time a customer on the second floor waits for an elevator.
What is the probability of randomly selecting a sample of 30 scores which has a mean attention span equal to or greater than 17 minutes.
What is the role of theory in research proposals? What are the elements of a study plan? Where might a beginning researcher lose logical flow among elements in a study plan? Why might that happen?
The times it takes workers to complete a task at a certain assembly plant are normally distributed with mean = 10 minutes and standard deviation = 2 minutes.
Rewrite this simplified radical form. Assume all variabel represent positive real numbers.
A random sample of 225 fathers from Littleton, yielded 97 who did not help with child care. Using a .05 level of significance test the claim that the proportion is at least 34%.
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
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