Question

Ouestron W a mp T Again, the Pew Research company surveyed 1, 500 randomly selected American adults (age 40-60). 18 % of the surveyed say they have texted in the car while driving after the No Texting law came out. A 90 % confidence interval was calculated and resulted in a margin of error of 0.016 Fill in the blanks: a. In other words the confidence interval obtained was b. We are 90% confident that the percent of all U.S. adults (age 40-60) driving after the No Texting law came out is between who have texted in the car while * % . * % and

Answer 1

a)

Confidence interval = $\hat{p}$ $\pm$ E , Where E is margin of error

= 0.18 $\pm$ 0.016

b)

We can write confidence interval as

$\hat{p}$ - E < p < $\hat{p}$ + E

0.18 - 0.016 < p < 0.18 + 0.016

0.164 < p < 0.196

16.4% < p < 19.6%

We are 90% confident that the percent of all U.S. adults (age 40-60) who have texted in the car while

driving after the No Texting law came out is between 16.4% and 19.6%