Independent Two sample tests

Independent Two sample tests -...

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INDEPENDENT TWO-SAMPLE TESTS REVIEW 1. When do we use a T-test to analyze statistical data?  2. When do we use a dependent samples t-test?  3. When do we use an independent samples t-test?  4. What is the advantage of using a dependent samples t-test?  5. If a dependent samples t-test is better because it reduces variability, then why don't we  always use a dependent samples t-test?  6. If group 1 has a variance of 120 with 100 subjects, and group 2 has a variance of 110  with 100 subjects, then what is the pooled variance?   7. If group 1 has a variance of 10 with 20 subjects, and group 2 has a variance of 30 with  40 subjects, then what is the best estimate of the population standard deviation?   8. If group 1 has a stdev of 100 with 90 subjects, and group 2 has a stdev of 110 with 80  subjects, then what is the pooled variance?   9. If group 1 has a stdev of 5 with 17 subjects, and group 2 has a stdev of 18 with 16  subjects, then what is the best estimate of the population standard deviation?  
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Independent Two sample tests -...

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