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Packages from packing machine have a mass, which is normally distributed with mean 200g and standard deviation 2g. Find the probability that the package from the machine weighs
a) less than 197g b) more than 200.5g
(use standard normal variable Z and normal distribution tables)
a multiple-choice test contains n questions. if answers are randomly selected the correct answer will be selected with
A business owner decides to use a binomial distribution to solve one of his problems. He knows there is a 60 percent probability that he will sell one of his Red Oak floors to any customer who comes into his shop and views the wood.
suppose that you are in a class of 29 students and it is assumed that approximately 13 of the population is
What is correlation? How is correlation used to understand the relationship between two variables? What is the difference between positive and negative (inverse) correlation?
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
solve the following standard normal probabilities to five decimalsa. pz gt 0.68b. pz gt -1.56c. pzd. p-1.22e. p2.78 gt
based on the nielsen ratings the local cbs affiliate claims its 1100 pm newscast reaches 41 audience. in a survvey of
Check that the formula (1) holds when X Unif(0, b). Formula (1) also works for b = 1. Check this when X is an Exponential RV with PDF f(x) = e-x for x 0.
No estimate of the population proportion is available. How large a sample is required?
1. what is the r value for the relationship between hamstring strength index 60degs and the shuttle run test? is this r
30 said that they planned to work in a rural community. Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
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