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The method to find the 95% confidence interval is to take the x -bar the z value times the standard deviation divided by the square

The method to find the 95% confidence interval is to take the x -bar

the z value times the standard deviation divided by the square root of the number of observations.

For this equation there was a sample of 64, mean of 7.4, standard deviation of 1.64.The confidence interval is 7.4 0.402. Please find an 80% confidence interval for this data:sample of 66, mean of 54, standard deviation of 7.49.

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