Description
Module 15 Homework 2 – Calculating & Interpreting a Two-Tailed Probability for a Sampling Distribution (21 of 23)
Start Assignment
Due Sunday by 11:59pm
Points 10
Submitting a text entry box or a file upload
Available after Mar 1 at 12am
Progress Check
Use this activity to assess whether you and your peers can:
Based on information about a sampling distribution of sample proportions, use the Normal Distribution Calculator to find a two-tailed probability.
Directions
Use the drop-down menu to learn about the three steps needed to complete this assignment.
Three steps to complete the assignment
Prompt
Recall the use of data from the National Health Survey to estimate behaviors such as alcohol consumption, cigarette smoking, and hours of sleep for all U.S. adults. In the 2005-2007 report, they estimated that 30% of all current smokers started smoking before the age of 16.
Suppose that we randomly select 100 U.S. adults who are smokers and find that 25% of this sample started smoking before the age of 16 (an error of 5% compared to the 2005-2007 report).
Is this much error surprising? Find the probability that a sample proportion will be an over- or underestimate of the parameter by more than 5%.
