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(A) What sums are needed to calculate a correlation coefficient?
(B) What are the two ways of testing a correlation coefficient for significance?
What is the null and alternative hypothesis? What is your final conclusion?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Real estate agents always say "location, location, location" is the most important thing in buying a house. We want to know if the sales prices of homes in two neighborhoods are similar. A random sample is taken from each neighborhood. The prices ..
If p denotes the p -value of the corresponding hypothesis test, which of the following is true?
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
The null hypothesis is to be tested at the 10% level of significance. The critical value from the table is:
each person received was determined by randomization. For each person who was sent one of the surveys, the researcher recorded whether or not a completed survey was returned.
What is the approximate permutation test P-value and What is the permutation test P-value for testing the equality of the means versus the hypothesis that the mean change for the treatment group is larger than the mean treatment for the control gro..
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
We want to test the hypothesis that population B has a smaller variance than population A.
Let be the average of the pay you receive for the first and second week. Find the sampling distribution
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval for the difference in the proportion of defectives.
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