Sample test for difference of population means
A two independent sample test for difference of population means is based on samples of size 25 and 28. What is the degrees of freedom for the corresponding t-distribution?
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At one point in the duct, the pressure and temperature are p=1800lb/ft^2 and T=500 degrees R, respectively. At a second point, the temperature is 400 degrees R. Calculate the pressure and density at this second point.
Data to test the difference between two weighing methods for wheat deliveries gave a mean difference of 10 kg with a sample standard deviation of the difference of 20 kg, from a sample of size 50. What is the value of the test statistic? Give your
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Consider light that is refracted by a prism shaped like an equilateral triangle. The incident ray is parallel with the prism's base. What is the total deflection of the ray, given that the index of refraction of the prism material is 1.50 ?
The sample standard deviations for two independent samples of size 20 each are 12 and 15. What is the estimate of the pooled standard deviation? Give your answer to 2 decimal places.
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The coefficient of kinetic friction between the box and the floor is µk = 0.47. If the system is set moving at v = 10.0 m/s with the block in front of the box, how long does it take for the system to come to rest?
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