Find the level of confidence assigned to an interval estimate of the mean formed using the following

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Find the level of confidence assigned to an interval estimate of the mean formed using the following intervals:

a. x  1.15 x to x  1.15 x

b. x  1.65 x to x  1.65 x

c. x  2.17 x to x  2.17 x

d. x  2.58 x to x  2.58 x

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