In a two-factor ANOVA design, the variances of the populations are assumed to be equal unless there is interaction present.
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Q. 2When deciding the null and alternative hypotheses, the rule of thumb is that if the claim contains the equality (e.g., at least, at most, no different from, etc.), the claim becomes the null hypothesis.
If the claim does not contain the equality (e.g., less than, more than, different from), the claim is the alternative hypothesis.
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Q. 3A company has 20 copy machines and every day there is a 5 percent chance for each machine that it will not be working that day. If the company wants to calculate the probability of, say, 2 machines not working, it should use the Poisson distribution.
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Q. 4In a two-factor ANOVA design with replications, there are three hypotheses to be tested; test for factor A, test for factor B, and test for interaction between factors A and B.
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Q. 5A direct marketing company believes that the probability of making a sale when a call is made to an individual's home is .02. The probability of making 2 or 3 sales in a sample of 20 calls is .0593.
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Q. 6Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 10 hours.
What is the probability that a single battery randomly selected from the population will have a life between 70 and 80 hours?A) 0.2412
B) 0.3830
C) 0.1712
D) 0.5121
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