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An internal study by the Technology Services department at Lahey revealed company employees receive an average of 2 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
What is the probability Linda Lahey company president received exactly one email between 4pm and 5pm yesterday?
a. What is the probability she received 5 or more emails during the same period?
b. What is the probability she did not receive any emails during the period?
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
The student body of a large university comprises 60% female students. Elucidate what is the probability that the students in the sample exactly two are female?
What will be critical value of chi-square if test is to be performed at 0.025 level? At the 0.05 level?
Evaluate your histograms for any outliers in your data. Based on your evaluation of outliers, you may trim no more than 1% of the data contained in the data set. This must be done symmetrically (i.e., trimming no more than 0.5% off the top and 0.5..
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
What is the probability that a U.S. user who downloads music, selected at random, obtained it from either the United States or Canada.
How does the bell-shaped curve for the sampling distribution of sample means for samples of size n = 100 compare to the bell-shaped curve for sampling distribution of sample means for samples of size n = 60.
Determine the probability of fatal accident over lifetime? Describe your reasoning carefully. Suppose independent events. Why might the supposition of independence be violated?
If code is 4 random letters, and letters can be utilized multiple times, how many different possible codes are there?
Why is estimating a multiple regression model just as easy as bivariate regression?
The budgeting process for a Midwestern college resulted in expense forecasts for the coming year (in $ millions) of $9, $10, $11, $12, and $13. Since the actual expenses are unknown, the following respective probabilities are assigned: .3, .2, .25..
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