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In a class with 18 boys and 12 girls, boys have probability 1/3 of knowing the answer and girls have probability 1/2 of knowing the answer to a typical question the teacher asks. Assuming that whether or not the students know the answer are independent events, find the variance of the number of students who know the answer.
Suppose the paper cannot support the fixed expenses of a full-production setup if the circulation drops below 321,000. If the probability of this event occurring is low, the production manager might try to keep the full crew in place and not disru..
Find the marginal probabilities, are Disney and Amazon stock returns independent and what is the mean and variance of the stocks D and A?
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
the alphacor company experiences some type of failure on its computer network on average once every 4 hours. assume
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. What is the probability that a randomly selected terminal will last more than 5 years?
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis? What might happen if we do not use this p-value in particular, when we are rejecting a Null hypothesis?
Either use the p-value approach to hypothesis testing or use the significance level approach with α = .05.
Using Chi-square table finding the P-value and interpret the result
If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
Let us speek where the preceding data are representative of the entire sector of retail sales companiesSuppose the annual profits are more than 6.5 thousand $ every employee.
test null hypothesis: Meu=80 against alternative hpothesis=negative = 80 (alpha =.05). What does this tell you about meu?
Compute the probability for the given frequency distribution.
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