Con?dence interval for the variance

Reference no: EM13965242

The rates of return (rounded to the nearest percentage) for 25 clients of a ?nancial ?rm are given in the following table.

13	11	28	6 -4 15 13 6 11 11
3	12	20	3 16 16 15 8 20 15
4	1	12	2 -9

Find a 98% con?dence interval for the variance σ2 of rates of return. Use this to ?nd the con?dence interval for the population standard deviation, σ.

Reference no: EM13965242

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Con?dence interval for the variance : (a) Obtain a 99% con?dence interval for the variance σ2. (b) Is it reasonable to assume that the data follow a normal distribution?

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