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Calls to a customer service center last on average 1 minutes with a standard deviation of 1.3 minutes. An operator in the call center is required to answer 91 calls each day. Assume the call times are independent.
What is the approximate probability that the total time spent on the calls will be greater than 98 minutes? Give your answer to four decimal places. Use the standard deviation as you entered it above to answer this question.
In a study, the carapace lengths (in mm) of Thenus lobster caught near Singapore measured: 78,66,65,63,60,60,58,56,52 and 50 ( the population data is approximately normal).
Determine regression line for predicting January temperature from latitude.
How are the goals of the tests similar and different? How are the tests used? What are the purposes of giving these differing tests?
You wish to find out if negative relationship exists between amount of bottled water someone drinks and their water bill. Create a prediction model, if suitable.
A point estimate for a parameter is a single number designed to estimate a quantitative parameter of a population, usually the value of the corresponding sample statistic
Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and discuss.
Visa Card USA studied how frequently young consumers, ages 18 to 24, use plastic cards in making purchases. The results of the study provided the following probabilities.
Re item 4, assume the critical value for this test is 4.92, and you obtain a computed statistical value of 7.45. Is there evidence to refuse null hypothesis? Describe why or why not?
In what sense is this business problem? A societal problem? An individual problem?
For a sample with n=36, the mean duration of a geyser is 3.55 minutes and the standard deviation is 0.63 mintues. Using chebychev's theory, determine at how many of the eruptions lasted between 2.29 and 4.81 mintues.
A bag contains 4 chips of which one is red, one is blue, one is green, and one is yellow. A chip is then selected at random from a bag and then replaced in the bag.
The lifetime of a super tough AAA battery is normally distributed wit mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random
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