Assume a random sample n=25 with a sample mean diameter = 0.48 cm.Assume a random sample n=25 with a sample mean diameter = 0.51 cm.Ball bearings with diameters that are too small or too large are problematic. A manufacturing process produces ball bearings with diameters that have a normal distribution with mean, μ = 0.50 centimeters and known standard deviation, σ =.Perform a hypothesis test to determine if the pollution levels are significantly lower for α = 0.05. Assume their sample of size 50 gives a mean of 32.5 ppm. ![]() ![]() A group of environmentalists will test to see if this is true. A group of factory representatives whose companies discharge liquids into the river is now claiming they have lowered the average with improved filtration devices. Two-Tailed Test: A two-tailed test is a statistical test in which the critical area of a distribution is two-sided and tests whether a sample is greater than or less than a certain range of values. If you a priori believe that if there is a relationship then it will only be in one direction (or that a relationship in the other direction will have the same results as no relationship) then a one-tailed test is appropriate.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |