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Consider t = -2.50 and t = -2.54. Which t ratio has the smaller p value? Provide a rationale for your answer. What does this results mean?
Surveys have been widely used by politicians around the world as a way of monitoring the opinions of the electorate. Six months ago, a survey was undertaken to determine the degree of support for national party leader.
The following data pertain to the chlorine residual in a swimming pool at various times after it has been treated with chemicals:
let x be a random variable that represents white blood cell count per cubic milliliter of whole blood. assume that x
Do these data provide evidence that metal-tagged penguins have a later mean arrival time?
the salinity in the ocean is expressed in parts per thousand ppt. during november 2008 the mean salinity in a region of
Using a test, 80% of Down's Sydrome cases can be identified, while 5% of normals are detected as positive. What is the sensitivity and specificity of the test?
The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or below) the mean?
1. What was the relationship among intellectual, political, economic, and social changes in the eighteenth century? What similarities and differences do you see between the French Revolution and contemporary revolutions? (at least 300 words to ans..
A certain virus infects five in every 400 people. A test used to detect the virus in a person is positive 85% of the time when the person has the virus and 8% of the time when the person does not have the virus. Using Bayes' Theorem, when a person ..
Conditional and compound probabilities.The table below gives the distribution of blood types by gender in a group of 1000 individuals.
Testing indicates that the lifetimes of a shipment of disposable butane lighters are normally distributed with a mean of 1000 lights and a standard deviation of 100. What percentage of these lighters will:
To forecast future cigarette sales, the last four years' quarterly sales were recorded in the Excel file Tute10-Q1.xls. Calculate the 3-quarter and 5-quarter moving averages. Show the relevant graphs. Interpret the results. Compute MAD and SSE for ea..
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