A Single Population Mean using the Normal Distribution · Try It 3

shows a different random sampling of 20 cell phone models. Use this data to calculate a 93% confidence interval for the true mean SAR for cell phones certified for use in the United States. As previously, assume that the population standard deviation is σ = 0.337.

$$\begin{array}{cc}\text{SAR Data for a sample of 20 cell phones}& \\ \text{1.48}& \text{1.53}\\ \text{0.8}& \text{0.68}\\ \text{1.15}& \text{1.4}\\ \text{1.36}& \text{1.24}\\ \text{0.77}& \text{0.57}\\ \text{0.462}& \text{0.2}\\ \text{1.36}& \text{0.51}\\ \text{1.39}& \text{0.3}\\ \text{1.3}& \text{0.73}\\ \text{0.7}& \text{0.869}\end{array}$$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Statistics 2e · §8.1 A Single Population Mean using the Normal Distribution · Try It 3