Question

If a method produces a random error for each measurement of 4%, but a percent error of equal to or less than 1% is required for this value for later analysis, what is the minimum number of measurements that must be collected and averaged? You will need to solve equation 1 for the value of n that meets the criterion of a 1% error in the average.

Answer 1

Answer:

Nice question

Explanation:

But I don't know how to solve it☺☺

Answer 2

Answer:

Here is the formula you need to use to solve for sample size ...

Margin of Error = (1.96)(standard deviation) / sqrt n

So, here is a simple example ...

sample mean = 20 mg

standard deviation = 1.5 mg

Margin of error = 1% of 20mg = 0.2mg

0.2mg = (1.96)(1.5 mg) / sqrt n , now solve for n ...

n = 217