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The company wishes to know which is the best model to adopt for the aircraft based on the following variables:
safety
comfort
durability
life-cycle cost
The company wishes to use "hard" data from tests and "soft" data from surveys.
1. The seats were subjected to a safety stress test in which scores were assigned on a continuous scale of 0 to 10. This test was performed on a large sample of model C seats. The mean score was 6.8 with a standard deviation of 0.34. You may assume that the scores are normally distributed and the stated mean and standard deviation represent our best estimate of those population parameters.
A. Suppose model C seats were produced by the thousands and suppose we selected one at random from the huge warehouse full of them. What is the probability that we get a seat that would score above an 7.3 on the safety stress test?
B. What is the probability that you get a seat that would fail the stress test if failing is a score of 6.2 or less?
C. Estimate the probability that you get a seat that would score 7.2.
D. Suppose you select a sample of 5 seats, subject each of them to the stress test and compute the mean score for the sample. What is the probability that the mean score will be less than 6.2?
There is evidence to reject the claim that the rodent type and the success of finishing the maze are not related because the test value 3.841 > 2.773
The accounting department at Western Materials Inc. national manufacturer of unattached garages, reports it takes two construction workers of a mean of 32 hours and standard deviation of 2 hours to erect Red Barn MODEL.
Is this correlation statistically significant? He also found the regression coefficient to be -1.66. Is this regression coefficient statistically significant? Explain why or why not for each.
Hamburger Joe's sells the best burgers in town. The variable unit cost for making one burger is $.97. The fixed cost of making burgers for 12 months will be a total of: $140,000.
Suppose we wish to estimate the population mean using a confidence interval. When is it appropriate to use a z-score? When is it appropriate to use a t-score?
The distribution of box weights is normally distributed with a mean of 9 ounces and a variance of 0.01 ounces. What is the probability of randomly selecting a box containing less than 8.9 ounces?
The probability that a bomber hits its target on any particular mission is 0.80. Four bombers are sent after the same target. What is the probability: they all hit the target?
What is the probability that she gets exactly 4 bull's-eyes? How many bull's-eyes do you expect her to get out of the 6 arrows and what is the standard deviation?
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
At the .05 significance level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees? Use the five-step hypothesis-testing procedure.
For machine gun ammunition to be acceptable, the US Army requires that 96 percent of rounds fired hit a specified target. The test is to fire a 50 round burst at the target and observe whether this condition is met.
Determining probability values using the Binomial distribution.Use the Binomial distribution to determine the probability that four or more of the contracts are in breach of the tendering guidelines.
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