When one would use a t test a when the population

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4.When one would use a t-test? a.When the population variance is knownb.When the population variance is unknownc.When the shape of the population is positively skewedd.When the shape of the population is negatively skewed 5.When would one use a t-test for dependent means? 6.A study is conducted using a t-test for dependent means with 20 subjects. If the estimated population variance is equal to 40, then what would the variance of the distribution of the means of change scores be?
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QUIZ 8 (Questions 7 – 10). A therapist believes she has come up with a new procedure to increase prosocial behavior. Assessments for each subject are taken twice, once before being introduced to the procedure, and then 3 weeks after the subjects were exposed to the new procedure. The true
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