In monitoring lead in the air after the explosion at the battery factory, it is found that the amounts of lead over a 7 day period had a standard error of 1.91. Find the margin of error that corresponds to a 95% confidence interval. (Round to 2 decimal places)

Step-by-step explanation:

-Given that

-We determine the z-value corresponding to the 95% confidence level:

-The margin of error is the degree of error from the real value and is calculated as follows:

Hence, the margin of error is

correct answer:

i^31 = -i

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step-by-step explanation: