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Zip codes. holes-r-us, and internet company that sells piercing jewelry, keeps transaction records on its sales. At a recent sales meeting, one of the staff presented a histogram of the zip codes of the last 500 customers so that they might understand where sales are coming from. Comment on the usefulness and appropriateness of the display.
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A company that has a large number of supermarket grocery stores claims that customers who pay by personal checks spend an average of $87 on groceries at these stores with a standard deviation of $22.
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A gallop poll that was based on telephone interviews conducted April 9-12, 2012, using a random sample of 1016 adults aged 18 and older, living in all 50 US states and the District of Columbia, indicated that 29% of Americans spent more money in rece..
Each customer has probability p of being a home owner independently of all other customers. Let Y be the number of home owners registered. Show that Y~Poisson.
Use the critical values for z of 1.65 and a p level of approximately 0.10, or 10%. For each of the following values, determine if you would reject or fail to reject the null hypothesis:
Determines the sample mean outer diameter to be 1.002 inches with a standard deviation of 0.003 inch. Calculate the process capability index for this example.
Can you test the significance of the relationship between physical activity level and systolic blood pressure, adjusting for age, and weight, given the ANOVA table above?
Let X be the number obtained on the blue die minus the number obtained on the red die. Draw a histogram for its probability function and a graph for its distribution function.
Data shows the average GPA of students at a school is 2.9. The GPA of a random sample of 16 biology students is 3.1 (with sample standard deviation= 1.2)
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
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