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To determine the efficiency of a batch of production of electric motors 8 are tested. The average efficiency of a sample is calculated to be 88.5% and the standard deviation of the sample is 0.5%. Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
A random sample of 60 days shows that the mean daily number of gallons sold is 10.00. What is the point estimate of the population mean?
When no natural gas is present the test is accurate 90% of the time. Find the best set of decision for the landowner to maximize her profit.
If gambler rolls two dice and gets sum of four, he wins $10; and if he gets sum of three, he wins $25. Cost to play game is $5. What is expectation of this game?
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
How would you use the concept of probabilities to apply to profiles for hiring more satisfied individuals?
Descriptive statistics for each of the four variables along with a discussion of what the descriptive statistics tell us about the motion picture industry?
Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
Based on p=.60, probability that a randomly selected homeowners will say no to newspaper subscription.
Find the probability that fewer than 10 of those sampled currently have access to online services.
The critical F value with 6 numerator and 60 denominator degrees of freedom at α = .05 is:
If you draw two balls without replacing the first one, what is the possibility that one ball is red and the other is white.
If the company's report is correct, what is the probability that the average balance of an account in the sample is $383 or less?
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