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The length of time (in seconds) that a user views a page on a Web site before moving to another page is a lognormal random variable with parameters ? = 2.5 and w2 = 1.
a) What is the probability that a page is viewed for more than 10 seconds?
b) What is the length of time that 50% of users view the page?
c) What is the mean and standard deviation of the time until a user moves from the page?
How large a sample is required to estimate the actual proportion within a range of plus and minus 0.04? Use the 98 percent level of confidence. How is the z value found on the table?
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
The probability that a randomly selected elementary or secondary school teacher from a city is female is 0.68, holds a second job is 0.38, and is female and holds a second job is 0.29.
At the .10 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes. What is the decision rule?
Describe ways in which the use of MS Excel as a tool for interpreting data can be used by a manager of an organization.
The average for the test is a 1700 and the population's standard deviation is 50. what percentile rank of students is Logan in based on her SAT score.
The following table is based on information taken from the Medical Practice Characteristics section of the Statistical Abstract of the United States
What is the probability that 25% or fewer male employees will indicate that they have to pick up the slack for moms working flextime?
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
What is the best prediction for the number of products sold based on advertising costs of $7000?
There are three types of bread, three types of meat, three types of cheese, and four types of topping. How many different sandwiches can the restaurant make?
the national center for education statistics reported that mean number of instructional computers per public school
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