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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 ? = 0.5 and ?2 = 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?
Assume independent events. Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
The scores are normally distributed with a mean of 165 and a standard deviation of 17. If only the top 20% of the soldiers are selected, what would the cutoff score be?
Define the null hypothesis. If the null hypothesis is rejected then? Read the Z statistic from the normal distribution table:
By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
The average burglary rate for a particular jurisdiction has been 311 per year with a standard deviation of 50. What is the likelihood that the number of burglaries in the next year is between 250 and 300?
What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for which you might expect an interaction.
Determine the variance of firm's profit for the month.
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
If the weight distribution is known to be normally distributed, do the data support the veterinarian's suspicion? Conduct a hypothesis test at the 5% significance level. Define your parameter (μ), state your hypotheses, conduct the test and write ..
Normal distribution what percentage of students will make A's and what percentage will make B;s in the exam. Suppose standard cut-off for (A>=90) and B (80
a scientist attempts to perform a difficult experiment. she is successful in about 80 of her attempts. she attempts the
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