Table 2 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 = 0.337.

Table 2

Phone Model SAR Phone Model SAR

Blackberry Pearl 8120 1.48 Nokia E71x 1.53

HTC Evo Design 4G 0.8 Nokia N75 0.68

HTC Freestyle 1.15 Nokia N79 1.4

LG Ally 1.36 Sagem Puma 1.24

LG Fathom 0.77 Samsung Fascinate 0.57

LG Optimus Vu 0.462 Samsung Infuse 4G 0.2

Motorola Cliq XT 1.36 Samsung Nexus S 0.51

Motorola Droid Pro 1.39 Samsung Replenish 0.3

Motorola Droid Razr M 1.3 Sony W518a Walkman 0.73

Nokia 7705 Twist 0.7 ZTE C79 0.869

Fill in the blank and round to three decimal places.

Calculate the EBM: _________