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A compressor manufacturer is testing two differ- ent designs for an air tank. Testing involves pumping air into a tank until it bursts, then noting the air pressure just prior to tank failure. Four tanks of design A are found to fail at an average of 1400 pounds per square inch (psi), with a standard deviation of 250 psi. Six tanks of design B fail at an average of 1620 psi, with a standard deviation of 230 psi. Assuming normal populations with equal standard deviations, use the 0.10 level of significance in comparing the two designs. Construct and interpret the 90% confidence interval for the difference between the population means.
IQ tests generally have scores in which the mean is 100, and the standard deviation is 16. If your IQ score was 134, what percentage of the population would have a higher IQ than you?
Describe the individuals and the variables in this study. Specify the quantitative and the categorical variables -
you write a new app that can take a picture of someone and automatically draw a funny mustache on them. it takes 3
Your consulting company has been hired by an airline to analyze data on passenger and luggage weights. The data refer to a 200 seat aircraft that is always full. You are given data that show that as a good approximation passenger weights W ~ N (150, ..
If an applicant is randomly selected, find the probability of a rating that is between 200 and 275.
question the manager of the hippon drug store is remodeling his facility and is considering three ways of organizing
the height of the water level in mineral water bottles has a mean of 140 mm and a standard deviation of 4 mm. assume
Formulate a linear programming model for this problem.
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 40 people.
The chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?
a state makes licenses plates with four letters followed by four digits how many licences plates can you have with no
Can Mr. Rutter conclude that the mean weight of the bags is less than 50 pounds? Use the 0.1 significance level. In a brief report, tell why Mr. Rutter can use the z distribution as the test statistic.
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