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A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6.
A raw score of 47 is associated with what percentile?What are the z-scores that mark the middle 95% of this distribution?What is the median of this distribution?
A company is creating 5 new divisions and 8 managers are eligible to be appointed head of a division. With 8 managers trying for 5 jobs, how could the five new heads be arranged?
Which one of these statements concerning the creation of frequency tables for integer data is true? The procedure for creating them is the same as that for creating tables for qualitative data.
Two researchers are both interested in the relationship between caffeine consumption and activity level for elementary school children. Each obtains a sample of n = 20 children.
The mean, median, and mode are the most common measures of dispersion (spread).
Frequent checks of unfilled orders at end of day reveal that distribution of unfilled orders follows Poisson distribution with mean of two orders. Sketch the histogram representing Poisson probability distribution of unfilled orders.
The company statistician has reported the mean number of man-hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly.
List one unclear concept regarding regression and provide an example from your personal or work life where regression could be used to show a relationship between two variables.
If we want to estimate the selling price on the basis of age, which variable is the dependent and which is the independent? Draw a scatter diagram.
When planning the new baseball stadium for Washington DC, you are asked to find the break-even point for the number of luxury skyboxes built.
You are the owner of a small casino in Las Vegas. You want to reward high rollers who come to your casino. You want to give free accomodations to no more than 10% of your patrons. Suppose that the mean amount wagered by all patrons is $287 with a ..
A car rental company has determined that the probability a car will need service work in any given month is 0.2. The company has 900 cars.
Chicken Delight claims that 84 percent of its orders are delivered within 10 minutes of the time the order is placed. A sample of 70 orders revealed that 55 were delivered within the promised time.
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