Smartphone adoption among younger adults has increased substantially and mobile

Question

Smartphone adoption among younger adults has increased substantially and mobile access to the Internet is pervasive. 16% of young adults in one study are "smartphone-dependent," meaning that they do not have home broadband service and have limited options for going online other than their mobile device. Consider a sample of 12 young adults selected. Complete parts (a) through (d) below.

If you selected a sample in a particular geographic area and found that none of the 12respondents are smartphone-dependent, what conclusions might you reach about whether the percentage of smartphone-dependent young adults in this area was 16%?

Select the correct choice below and fill in the answer box to complete your choice.

(Type an integer or decimal rounded to four decimal places as needed.)

A. Since the probability of a sample in which none of the 12 respondents are smartphone-dependent is , there is no reason to question the given percentage because this probability indicates that such a sample is reasonable.

B.Since the probability of a sample in which none of the 12 respondents are smartphone-dependent is . , there is reason to question the given percentage because this probability indicates that such a sample is not reasonable.

Explanation / Answer

Since none of the 12 respondents are smartphone dependent, so the percentage of smartphone dependent is 0.0000.

So there is reason to question the given percentage because this probability indicates that such a sample is not reasonable.

Option B is correct

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