the following data were collected in a survey of 8th graders and summarize their
ID: 3295193 • Letter: T
Question
the following data were collected in a survey of 8th graders and summarize their cell phone status....no cell phone-boys=55..no cell phone girls 31....conventional cell phone user...boys=65...girls=78 smart phone user boys=35....girls=27
A) what proportion of the 8th graders has cell phones
B) what proportion of the boys does not have cell phones
c) is ownership of a cell phone independent of sex? Justify your answer
d) what proportion of smart phone users are boys?
work must be shown on how each answer was obtained
Explanation / Answer
a) Having phones = Tota - (55 + 31) = 291 - 86 = 205
Total students = 86 + 65 + 78 + 35 + 27 = 291
proportion of the 8th graders has cell phones = 205/291 = 0.7045 or 70.45%
b) Boys not having cell = 55
Total boys = 155
proportion of the boys does not have cell phones = 55/155 = 35.48%
c) Considering that 77.21% of girls and 64.52% of boys own a cell phone Iwould say that cell phone ownership is independent of sex because thepercentages are within a close range.
d) Total smartphone users = 62
Boys smartphone users = 35
proportion of smart phone users are boys = 35/62 = 56.45%
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