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Three parts are assembled in a series so that their critical dimensions x1, x2 and x3 add. The dimensions of each part are normally distributed with the following parameters: μ1 = 100, σ1 = 4, μ2 = 75, σ2 = 4, μ3 = 75, and σ3 = 2. What is the probability that an assembly chosen at random will have a combined dimension in excess of 262?
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
use the following sample data to test whether the GPA are different at the 0.05 level of significance.
Any analysis required to check the required conditions (note that if you find that you cannot meet the required conditions for the test you expected to do, you must use the appropriate non-parametric test)
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
Determine the regression equation. Determine the coefficient of determination. Do you think Mr. Profit should be satisfied with using the size of the offering as the independent variable?
Professor Jennings claims that only 35% of the students at Flora College work while attending school. The dean thinks that the prof. has underestimated the number of students with part-time or full-time jobs.
One advantage of the repeated measures ANOVA is that it eliminates "individual differences" as a source of variability. Explain why there are no individual differences in the numerator and in the denominator of the F ratio.
From National Weather Service records, the annual snowfall in the TopKick Mountains has a mean of 92 inches and a standard deviation ? of 12 inches.
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours
Normal distribution has mean of 80 and standard deviation of 14. Find out the value above which 80 percent of values will occur.
An engine system consists of three main components in a series, all having the same reliability.
From a previous study, the standard deviation of the ages is known to be 3 years.
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