Question

find the range , variance and standard deviation for the given sample data . include appropriate units in the results .

listed below are the measured radiation absorption rates (in w/kg) corresponding to various cell phone modes. if one of each model is measured for radiation and the results are used to find the measures of variation are the results typical of the population of cell phones that are in use ?

s n the resuts Listed belbow are the mrd ridution aborplion rates (n Wng)coesponding t typical of the population of cell phones that are in une? to various cel phone models M one of each model is measured for radilation and the resuts are uned to find the measures of varlalion are the resus 0.61 1 36 093 0 75 0 56 1.14 1.11 1.12 1.19 1.43 0 55 The range of the samplo data i d to three decimal places as needed Round to three decimal places as Sample variance Round to three decimal places as needed) t one of each model is measured for radiation and the results are vsed to find the measures of variation, are the resuts O A. No. because some models of cel phones will have a larger markat share than others О с. Yes because the rosas from any sample of cel phones wil be typical of the populaton Measures from diferent models should be epresented in the sample Any sample that considers all possible cel phone models will produce reaults typical ol e nepuiation clhoe weighted according to thei size in the populition oach cell phone model s not roprosentative o shc phone model to have at least 5 of each cell phone in oader to get a meaninglul result Only indluding one o

Answer 1

range=maximum-minimum = 1.43-0.55=0.88 W/Kg

Sr. no	X	(X - X̄)²
1	1.43	0.205
2	0.55	0.183
3	0.56	0.174
4	1.14	0.026
5	1.11	0.018
6	1.12	0.020
7	1.19	0.045
8	0.61	0.1
9	1.36	0.146
10	0.93	0.002
11	0.75	0.052

	X	(X - X̄)²
total sum	10.75	1.006618182
n	11	11

mean =    ΣX/n =    0.977
      
      
sample std dev =   √ [ Σ(X - X̄)²/(n-1)] =   0.317 W/Kg

sample variance =    Σ(X - X̄)²/(n-1)=   0.101 (W/Kg)²

answer is

No,because some models of cell phones will have a longer market share than others. Measures from different models should be weighted according to their size in population

option a)