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Back to 8.1 A Single Population Mean Using the Normal Distribution

8.1 Exercise 5

Avg difficulty 2.5

the table shows a different random sampling of 20 cell phone models. Use these data to calculate a 93 percent 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.

Phone Model SAR Phone Model SAR
450 1.48 1450 1.53
550 0.8 1550 0.68
650 1.15 1650 1.4
750 1.36 1750 1.24
850 0.77 1850 0.57
950 0.462 1950 0.2
1050 1.36 2050 0.51
1150 1.39 2150 0.3
1250 1.3 2250 0.73
1350 0.7 2350 0.869

OpenStax Statistics, 8.1 A Single Population Mean Using the Normal Distribution, exercise 5

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