We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
However, I will give you a start.
Find the means first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
I'll let you do the calculations and choose the statistical test.
Data below corresponds to sample weights of two different types (A and B) of Tuna.
We want to test at significance level � = .05 if the two tuna populations from which
the samples come have the same variance.
A .99 1.92 1.23 .85 .65 .69 .6 .53 1.41 1.12 .63 .67 .6 .66 1.9
B 2.56 1.92 1.3 1.79 1.23 .62 .66 .62 .65 .6 .67
Figure 1: Tuna weights
[5] (a) Compute sample variances S2
1 and S2
2 of the two types A and B.
[5] (b) Run the appropriate statistical test and conclude if there is a difference in the
two population variances.
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