6.24 Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054 use a social networking site.- Find and interpret a 95% confidence interval for each of the following proportions: (a) Proportion of US adults who use the Internet regularly. (b) Proportion of US adult Internet users who use a social networking site. (c) Proportion of all US adults who use a social networking site. Use the confidence interval to estimate whether it is plausible that 50% of all US adults use a social networking site.
6.24 Social Networking Sites In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054 use a social networking site.- Find and interpret a 95% confidence interval for each of the following proportions: (a) Proportion of US adults who use the Internet regularly. (b) Proportion of US adult Internet users who use a social networking site. (c) Proportion of all US adults who use a social networking site. Use the confidence interval to estimate whether it is plausible that 50% of all US adults use a social networking site.
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Chapter 6 Opener
6.1-D Distribution of a
Proportion
6.1-CI Confidence
Interval for a Proportion
6.1-HT Hypothesis Test
for a Proportion
6.2-D Distribution of a
Mean
6.2-CI Confidence
Interval for a Mean
6.2-HT Hypothesis Test
for a Mean
6.3-D Distribution of a
Difference in Proportions
6.3-CI Confidence
Interval for a Difference
in Proportions
6.3-HT Hypothesis Test
for a Difference in
Proportions
6.4-D Distribution of a
Difference in Means
6.4-CI Confidence
Interval for a Difference
in Means
6.24 Social Networking Sites
In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet regularly. Of the Internet users, 1054 use a
social networking site.- Find and interpret a 95% confidence interval for each of the following proportions:
(a) Proportion of US adults who use the Internet regularly.
(b) Proportion of US adult Internet users who use a social networking site.
(c) Proportion of all US adults who use a social networking site. Use the confidence interval to estimate whether it is plausible that 50% of
all US adults use a social networking site.
6.25 What Do People Do on Facebook?
In the survey of 2255 US adults described in Exercise 6.24, we also learn that 970 of the respondents use the social networking site
Facebook. Of the 970 Facebook users, the survey shows that on an average day:
• 15% update their status
• 22% comment on another's post or status
. 2004 aem
LIT
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