## Description

## 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.

## Learn by Doing

Use the * rubric at the bottom of this page* as a guide for completing this assignment.

### Directions

**Submit your work:**

- Commit a good-faith effort to address all items in the Prompt section below. Please be sure to number your responses.

**Complete your assigned peer reviews:**

- After you submit your initial good-faith attempt, continue to the ANSWER(S) page and review your instructor's response. But please
**do****not**submit your corrected work yet. - Within three days after the due date, return to this assignment and complete your assigned peer reviews (directions (Links to an external site.)).

**Submit your corrected work:**

- We all learn from mistakes (our own and our classmates' mistakes). So please do
__not__immediately correct your own mistakes. If possible, wait until you receive feedback from at least one of your peers. - If necessary, correct your work and resubmit the entire assignment. Your instructor will only review and grade your most recent submission, so please do not refer to a previous submission.

### 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. 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%.

I

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## Explanation & Answer

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