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A newspaper headline stated that at a recent budget workshop, nearly three dozen people supported a sales tax increase to help deal with the city's financial deficit (San Luis Obispo Tribune, January 22, 2005). This conclusion was based on data from a survey acknowledged to be unscientific, in which 34 out of the 43 people who chose to attend the budget workshop recommended raising the sales tax. Briefly discuss why the survey was described as "unscientific" and how this might limit the conclusions that can be drawn from the survey data.
consider random variables x and y with a joint pmf given in the following table.x y 0 1 2
The following table represents a summary by state for Medicare enrollment (in thousands) for 15 randomly selected states in 1998 (source: Statistical Abstracts of the United States, 1999).
If you walked around your school campus and asked people you met how many keys they were carrying, would you be obtaining a random sample?
In a shipment of 10,000 of a certain type of electronic component, 300 are defective. Suppose that 50 components are selected at random for inspection.
according to the center for disease control and prevention publication health united states in 2002 16.5 of persons
Questions 3a through 3d are based on a distribution of scores with and the standard deviation = 6.38. Draw a small picture to help you see what is required.
Test the hypothesis that the median SAT score is 1000 against the alternative that it is greater using α = 0.05. Use both the sign test and the Wilcoxon signed rank test. Explain if the conclusions are different.
Many retail stores offer their own credit cards. At the time of the credit application the customer is given a 10 percent discount on the purchase.
write a null and alternative hypothesis for the following reseach question is there relationship between student gender
Why does an increase in the expected price level reduces the quantity of goods and services supplied?
What is the approximate probability that the mean diameter x of the sample of 25 bearings will lie within 0.0001 inch of the population mean diameter of the bearings?
A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive statements made about oneself is recorded for each participant during the first meeting.
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