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A market research firm employs a large number of typists for data entry. The time it takes for new typists to learn the computer system is known to have a normal distribution with a mean time of 90 minutes and standard deviation of 18 minutes.
What proportion of new typists need between 1 and 2 hours to learn the computer system? P(60 ≤ X ≤ 120 min.)
The mean time to download an Google video is 1 minute 30 seconds. Suppose the download time is normally distributed with standard deviation of 20 seconds.
Conduct test to find out if average sales invoice this month differs from the historical data. Level of significance a = .05
Determine point estimate of population mean? By using 90% confidence, determine the margin of error?
If people on your floor of dorm bought 425 of those tickets, determine the probability that someone on your floor will hold winning ticket?
The university policy department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with mean of 6.0 tickets per day. Find the p..
What is pooled variance and why is it important? Explain what interval data is and give an example: Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:
In 2010, the average age of students at UTC was 22 with a standard deviation of 3.96. In 2013, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and supp..
21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes. A random survey of 36 phone calls results in the mean 3.3311 and standard deviation 2.1788.
He can award a bonus to 20 percent of the representatives. What is the cutoff point between those who earn a bonus and those who do not?
According to the local union president, the mean gross income of plumbers in the Salt Lake City area follows the normal probability distribution with a mean $45,000 and a standard deviation of $3,000.
What is the probability that the device will detect at least one of the two shoppers entering together?
Forecasting: The sales data for the lone star Sports Apparel Company for the last 12 years are as follows: What is the 2001- 2012 compound growth rate?
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