Test Questions
1. In a survey of 1254 adults, it was found that 74% of them use some form of social media.
a. From this survey, how many adults use some form of social media? Round to the nearest whole number.
b. Construct a 96% confidence interval to estimate the true percentage of adults for the overall population who use some form of social media.
c. Determine the margin of error.
d. Write out the interpretation.
1. From a newly published study on the recent expansion of the vaping industry, it was found that the average age of those w ho vape JUUL products w as roughly 22.7 years old with a standard deviation of 10.3 years. This comes from a sample of 526 users of vaping products.
a. Construct a 90% confidence interval to estimate the true mean age of the overall population of JUUL product users.
b. Construct a 99% confidence interval to estimate the true mean age of the overall £ population of JUUL product users.
c. Which confidence interval has a wider range?