How would the null and alternative hypotheses be worded?

A researcher wishes to study the effect of cognitive behavior therapy on young people diagnosed with depression. Consider and discuss the following questions as you respond:
Would you recommend using a z test, a t test, or an ANOVA for the analysis? Explain your answer.
What would your choice of test depend on? For the test you select, explain your design and your comparison groups.
Would the hypothesis be directional or nondirectional?
Would the test be one or two tailed?
How would the null and alternative hypotheses be worded?

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