A study of 40 white mice showed that their average weight was 3.20 ounces. The standard deviation of the population is 0.8 ounces. Which of the following is the 80%
Confidence interval for the mean weight per white mouse?

Question

Quizplus · Accepted Answer

The 80% confidence interval for the mean can be calculated using the formula for the confidence interval of the mean: $\bar{x} \pm Z \frac{\sigma}{\sqrt{n}}$, where $\bar{x}$ is the sample mean, $Z$ is the Z-score corresponding to the desired confidence level, $\sigma$ is the population standard deviation, and $n$ is the sample size. For an 80% confidence level, the Z-score is approximately 1.28. Plugging in the given values: $3.20 \pm 1.28 \times \frac{0.8}{\sqrt{40}}$, we get the interval $3.04 < \mu < 3.36$.

A Study of 40 White Mice Showed That Their Average 3.04<μ<3.363.04 < \mu < 3.363.04<μ<3.36

A Study of 40 White Mice Showed That Their Average $3.04 < \mu < 3.36$