Question 8 4 pts You are testing the means of two independent samples using a po

Question

Question 8 4 pts You are testing the means of two independent samples using a pooled variance t-test. Sample 1 has 30 observations and a sample variance of 10. Sample 2 has 40 observations and a sample variance of 8. What is the pooled estimate of the common variance used in constructing t.? Round your answer to 2 decimal places. Question 9 4 pts As a rule, the significance level of a hypothesis test is set at 0.05 unless there is justification for setting it at a different level. In a test you are conducting, if Ho is true and Ho is rejected your company will needlessly spend $10 million. Where should you set a? Less than 0.05 0.05 Greater than 0.05

Explanation / Answer

Solution8:

pooled variance=Sp^2=(n1-1)s1^2_(n2-1)s2^2/n1+n2-2

=(30-1)*10+(40-1)*8/30+40-2

=8.85

ANSWER:8.85

Solution9:

you should set alpha=0.05

as nothing specified here.

ANSWER:0.05

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