Obtain a 95 confidence interval estimate for population

Assignment Help Basic Statistics

A researcher obtains data for witch

Xbar₁ =16.63 s₁ =1.42 n₁=12

Xbar₂ =17.93 s₂ =3.16 n₂=18

1 = control group

2= experimental group

a) Obtain a 95% confidence interval estimate for population varience, the standard deviation of the experimental group.

b) Test the hypothesis that the experiment was effective at the alpha=0.05 significance.

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