Question

there are a total of 38 macaw parrots at a Disney park they weigh on average mu = 2.3 pounds with standard deviation= .20 pounds assume the weight of macaw parrots is normally distributed Construct a 90% confidence interval for the macaw parrots

Answer 1

To construct a 90% confidence interval

Let's follow the following steps

Step 1: List out all the parameters

$\begin{gathered} n\text{ = 38} \\ \vec{}x\text{ = 2.3} \\ \sigma\text{ =0.2} \end{gathered}$

Step 2: Use the formula

$\vec{}x+Z_{\alpha}\text{ x}\frac{\sigma}{\sqrt[]{n}}$