Confidence interval: Unpooled t-test

Confidence Interval Unpooled t

3 Activities

Farmed salmon and wild salmon are randomly sampled.  We can't assume that population standard deviations are equal.

Sample SizeMean (ng/g)Standard DeviationFarmed Salmon27308Wild Salmon243913\begin{array}{|l|c|c|c|}\hline
& \text{Sample Size} & \text{Mean (ng/g)} & \text{Standard Deviation}\\\hline
\text{Farmed Salmon} & 27 & 30 & 8\\\hline
\text{Wild Salmon} & 24 & 39 & 13\\\hline
\end{array}Farmed SalmonWild Salmon​Sample Size2724​Mean (ng/g)3039​Standard Deviation813​​

Construct a 99% confidence interval for the difference in mercury levels.

Which type of salmon should you eat?

 We are 99% confident that the difference in mercury level is between 0.56 and 17.44 ng/g.

 We are 99% confident that the difference in mercury level is between 0.39 and 17.61 ng/g.

 We are 99% confident that the difference in mercury level is between 0.9 and 15.61 ng/g.

 We are 99% confident that the difference in mercury level is between 0.67 and 17.33 ng/g.

I don't know

Confidence interval: Unpooled t-test

Related Topics

Confidence Interval Unpooled t