What is meant by degrees of freedom

Reference no: EM13778335

1. What is meant by "degrees of freedom"? As the degrees of freedom increase, what happens to the graph of a t-distribution?

2. Why would you use a z-test rather than a t-test? Which do you think you will use more often? Why

3. What is the difference between a critical value and a test statistic?

Reference no: EM13778335

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