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Physical Sciences
The Palmer Drought Severity Index (PDSI) is a measure of prolonged abnormal dryness or wetness. It indicates general conditions and is not affected by local variations. An index value of -4 indicates extreme drought, and +4 represents very wet conditions. A random sample of the PDSI for selected regions in the Eastern United States for the week ending July 6, 2013, was obtained, and the data are given in the following table.
a. Is there any evidence to suggest the true mean PDSI is different from 0? Assume the underlying distribution is normal and use a = 0.01. Find bounds on the p value associated with this test.
b. Explain your conclusion in part (a) in terms of farming conditions and reservoir levels.
At the 0.10 level of significance, test the null hypothesis that the population variances are equal. Would your conclusion be different if the test had been conducted at the 0.05 level? At the 0.02 level?
Given: The paired sample data of the age of mothers and the weight of their children result in a linear correlation coefficient very close to 0.
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
Access the University of Phoenix Material, "Data for Inferential Practice Problems." Use the Excel® Analysis ToolPak? when necessary for the following:
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Problem Definition: Midwest Insurance wants to develop a model able to predict sales according to time with the company
The average of a list of 12 numbers is 9 and the SD is equal to 3. If the numbers 6 and 12 are included with this list of numbers, what is the average and SD of the new list
question the sugar producers association wants to estimate the mean yearly sugar consumption. a sample of 16 people
Find the mean life of beams.- What is the standard deviation of the life of beams?- Find the probability of a beam lasting more than 4000 days.
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