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An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 5 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
(a) What is the probability Linda Lahey, company president, received exactly 3 email between 4 P.M. and 5 P.M. yesterday? (Round your answer to 4 decimal places.)
(b) What is the probability she received 5 or more emails during the same period? (Round your answer to 4 decimal places.)
(c) What is the probability she did not receive any emails during the period? (Round your answer to 4 decimal places.)
Construct a hypothesis test to determine whether the average weight of a Smoky Bear moving van is more that 12,000 lb. Us a 5% level of significance.
What is the probability that a single randomly sampled battery of this type lasts longer than 100 minutes. Does this suggest that a charge-life exceeding 100 minutes would be unusual?
a random sample of n 36 measurements is selected from a population with mean equal to 5 and standard deviation 3. what
What are the mean, variance and standard deviation of the data? provided? What is the probability of occurrence (percentage) of ± 2 standard deviations?
Interpret the estimated coefficient for the toxemia variable and what are the odds of a hemorrhage for infants whose mother had toxemia?
students enrolled in an introductory statistics course at a university were asked to take a survey that indicated
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
the u.s. bureau of labor statistics produces consumer price indexes for several different categories. shown here are
For following set of scores, prepare a frequency distribution, a histogram, and a stem-and-leaf display for each variable. Also calculate the mean, the median and the standard deviation of each score.
question a large department store examined a sample of the 18 credit card sales and recorded the amounts charged for
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcox on rank-sum test, evaluate the significance of the results, assuming there are no ties.
assume that three industrial processes a b and c are independent. if the probability of successfully working for 8
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