Due to the popularity of instant messaging and social networking, informal elements such as emoticons (e.g., the symbol ":)" to represent a smile) and abbreviations (e.g., "LOL" for "laughing out loud") have worked their way into teenagers' school writing assignments. A survey interviewed 900 randomly selected teenagers by telephone on their writing habits. Overall, 449 of the teenagers admitted using at least one informal element in school writing assignments. Based on the survey results, construct a 90% confidence interval for the proportion of all teenagers who have used at least one informal element in school writing assignments. Give a practical interpretation of the interval. The 90% confidence interval is (.). (Round to three decimal places as needed.)

Due to the popularity of instant messaging and social networking, informal elements such as emoticons (e.g., the symbol ":)" to represent a smile) and abbreviations (e.g., "LOL" for "laughing out loud") have worked their way into teenagers' school writing assignments. A survey interviewed 900 randomly selected teenagers by telephone on their writing habits. Overall, 449 of the teenagers admitted using at least one informal element in school writing assignments. Based on the survey results, construct a 90% confidence interval for the proportion of all teenagers who have used at least one informal element in school writing assignments. Give a practical interpretation of the interval. The 90% confidence interval is (.). (Round to three decimal places as needed.)

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Concept explainers

Bar Graphs

A bar graph is a chart or graphical representation of data. A bar chart, also known as a bar graph, is a graph or chart that displays categorical data using rectangular bars with heights or lengths equal to the values they represent. Typically, bar graphs show categorical and numerical variables grouped in class intervals. A bar graph is useful for comparing and analyzing a set of data.

Question

### Informal Elements in Teenagers’ Writing: A Survey Analysis

**Introduction:**
With the rise of instant messaging and social networking, informal elements such as emoticons (e.g., the symbol ":)" to represent a smile) and abbreviations (e.g., "LOL" for "laughing out loud") have started to appear in teenagers' school writing assignments.

**Survey Methodology:**
A survey was conducted involving 900 randomly selected teenagers, who were interviewed by telephone about their writing habits.

**Key Findings:**
- 449 out of the 900 teenagers admitted to using at least one informal element in their school writing assignments.

**Task:**
Using the survey results, we aim to construct a 90% confidence interval for the proportion of all teenagers who have used at least one informal element in their school writing assignments.

**Interpretation of the Interval:**
The resulting confidence interval provides a range within which we can be 90% confident that the true proportion of teenagers using informal elements in school writing lies.

**Confidence Interval Calculation:**
The 90% confidence interval is provided in the blanks [] [].

*(Round to three decimal places as needed.)*

**Additional Resources:**
For assistance with constructing confidence intervals and understanding their practical significance, refer to our [Confidence Interval Guide (insert relevant link)].

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