A researcher wants to use a confidence interval to estimate the proportion of college students in his state who plan to vote in
the 2020 presidential election. He plans to randomly sample 120 college students, and plans to construct a 95% or 99% confidence interval. Which of these confidence intervals will be wider, and why
99% confidence interval will be wider because as the level of confidence increase the width increases as well and the standard error decreases
Step-by-step explanation:
The confidence interval is directly proportional to the sample size hence the 99% confidence interval will be wider than the 95% confidence interval of the sample of 120 college students
using a 99% confidence interval gives a more accurate result than a 95% confidence because the standard error decreases with increase in confidence interval
Step-by-step explanation: So if the seller sold the Blu-ray for 50% more than the original purchase price, it will equal to $27 from $18.00 - a $9.00 difference. An 8% sales tax was then charged on top of the $27.00 purchase that would total to $2.16 deduction.
$27.00 - 2.16 = <u>$24.84</u> for the total cost of the Blu-ray.
