One-tailed independent samples
A researcher conducts the one-tailed independent samples t test on 20 subjects (10 subjects in each group) and finds out that t=2.32665. How confident can the researcher be that the results are true and not because of mere sampling error?
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At a = 0.10, is there sufficient evidence to conclude that standard deviation for high temperatures is less than 10°?
An insurance company determines 45 percent of its claims have errors. The insurance company wants to estimate with 95 percent confidence the proportion of claims with errors. What sample size is required if they wish to be in five percent of the a
Six missiles are fired at a certain target. The probability that a missle will hit the target is 75%. What is the probability that of the six missiles fired
The number of complaints that the discount store receives on their product per week is random variable having Poisson distribution of 6.
Find the z-score corresponding to a score of X = 100 for each of the following distributions:
Suppose we have the population of scores with mean (µ) of 975 and a standard deviation (s) of 15. Suppose that the distribution is normal. Give answers to the following questions:
When the two hollow metal spheres are concentric with each other and the inner sphere has a potential of 88.8V and a radius of 0.138m. The potential of outer spheres is 77.9V and a radius of 0.138m.
Given a bcc structure produced by packing of hard spheres, calculate the largest sphere that can be introduced into the lattice without distortion and where is it located.
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