Question

If n=21, ¯x (x-bar)=39, and s=8, find the margin of error at a 90% confidence levelGive your answer to two decimal places.

Answer 1

Given

`\begin{gathered} n=21 \\ \bar{x}=39 \\ s=8 \\ C.I=90\text{\%=1.645} \end{gathered}`

Step-by-step explanation

The margin of error formula is given as;

`M.E=z_{(a)/(2)}*(s)/(√(n))`

Therefore, we will have;

`\begin{gathered} M.E=1.645*(8)/(√(21)) \\ M.E=2.87 \\ \end{gathered}`

Answer: 2.87