Concept explainers
Smartphones: A Pew Research report indicated that 73% of teenagers aged 13-17 own smartphones. A random sample of 150 teenagers is drawn.
Find the
Find the standard deviation
Find the probability that more than 70% of the sampled teenagers own a smartphone.
Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.76 and 0.80.
Find the probability that less than 75% of the sampled teenagers own smartphones.
Would it be unusual if less than 68% of the sampled teenagers owned smartphones?
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Elementary Statistics ( 3rd International Edition ) Isbn:9781260092561
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