# Question

What assumptions must be met in order to carry out a t test about a population mean?

## Answer to relevant Questions

How do we decide whether to use a z test or a t test when testing a hypothesis about a population mean? The bad debt ratio for a financial institution is defined to be the dollar value of loans defaulted divided by the total dollar value of all loans made. Suppose that a random sample of seven Ohio banks is selected and that ...Suppose we test H0: p = .3 versus Ha: ≠ .3 and that a random sample of n = 100 gives a sample proportion p-bar = .20. a. Test H0 versus Ha at the .01 level of significance by using critical values. What do you conclude? ...Explain what is meant by a. A serious Type II error. b. The power of a statistical test. If σ2 denotes the variance of the population of all outside diameters that would be produced by the new machine: (1) Test H0: σ2 = .0005 versus Ha: σ2 < .0005 by setting α equal to .05. (2) Find 95 percent confidence ...Post your question

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