Question
The proportion of adults who use the Internet is greater than $0.87$.
Step 1
A Type I error occurs when we reject a true null hypothesis, and a Type II error occurs when we fail to reject a false null hypothesis. Show more…
Show all steps
Your feedback will help us improve your experience
Kari Hasz and 87 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
According to a survey, 70% of adults between 50 and 64 years old use the Internet. You randomly select 80 adults in that age range and ask them if they use the Internet. Approximate the probability that 70 or more people say they use the Internet. Approximate the probability that between 50 and 70 people say they use the Internet.
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. ${ }^{7}$ 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.
Inference for Means and Proportions
Confidence Interval for a Single Proportion
According to a September 2008 poll and report done by Pew/Internet, $62 \%$ of employed adults use the Internet or e-mail on their jobs. What is the probability that more than 180 out of 250 employed adults use the Internet or e-mail on their jobs?
Normal Probability Distributions
Normal Approximation of the Binomial
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD