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Testing for population mean.
You conduct a survey of a sample of 25 members of this year's graduating students and find that the average GPA is 3.2. The standard deviation of the sample is 0.4. Over the last 10 years, the average GPA has been 3.0. Is the GPA of this year's students significantly different from the long-run average? At what alpha level would it be significant? How would this information be useful to you if you were the college register?
Determine the coefficient of correlation between the two variables. Interpret the value.
How large random sample of potential voters will be required to evaluate result with 95% confidence and with margin of error of plus and minus 3%?
Chi-square test for independent attributes - Are the opinions on the tax cut proposal independent of party affiliation? Use a = 0.01
To test is there any significant difference among two proportions. The Damon family owns a large grape vineyard in western New York along Lake Erie.
Use given data to create the unbiased point estimate of 12σ'> 2 of percentage of termites that are minor workers.
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
Calculate the population mean and population standard deviation.
Compute test statistic and p -value for each sample. (Negative amount must be pointed out by minus sign.)
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
Use MegaStat's output for multiple regression to determine the multiple regression equation
If the same sample results had been obtained from a random sample of 16 students, could the students' claim be accepted at a lower level of significance?
Florida State University administers a mathematics placement test to students where they 1st enter the university.
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