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If customers arrive according to a non-stationary Poisson process with rate function λ(t) = sin(t) + 5, is the time between the arrivals an exponential distribution?
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
Identify each of the random variables as continuous or discrete.
What's the probability that among three randomly selected high school students
Use a 1% level of significance to test the claim that there are more calls during the night than in the day.
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution
Find out the following probabilities. Probability that exactly 27 items will be good.
Determine the probability that their SAT scores will differ by more than 50 points?
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
Then test to see whether it considerably varies from 0 [use alpha = 5%]. Don't forget to identify the null and alternative hypotheses.
Test whether the average cycle of sleeping and waking differs significantly from 24 hours.
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
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