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These histograms graph the amount of time (hours per day) that 46 middle school girls and 40 middle school boys in San Francisco spend on the website FaceSpace. 50 boys and 50 girls took the survey but 4 girls and 10 boys did not use these sites at all. Each is graphed with a bin width of 0.25 hours.
How many boys spend more than 1.5 hours/day on social networking sites?
add up the last two bars
Compare the percentage of boys and girls that spend more than zero but less than 1 hour/day on these sites.
divide the girls by 46 and the boys by 40
about 50% of boys and about 22% of girls spend less than 1 hour/day
Find the interval where the median of the boys' data set lies
the median will be between the 20th and 21st value
0.75 – 1 hour/day
What can you conclude based on these graphs?
What does this make you think about the difference between girls and boys on social networking sites? (These answers will vary, so put on your mega-brain hats and come up with a conclusion in your own words.)
Girls spend much more time on these sites than boys. In addition, their times vary more widely, ranging from zero to 4 hours/day, while the boys' times top out at 2 hours/day.