## Related questions with answers

Cybersecurity survey. Refer to the State of Cybersecurity (2015) survey of firms from around the world, Exercise $1.20$ (p. 26). Recall that of the 766 firms that responded to the survey, 628 (or $82 \%$ ) expect to experience a cyberattack (e.g., a Malware, hacking, or phishing attack) during the year. Estimate the probability of an expected cyberattack at a firm during the year with a $90 \%$ confidence interval. Explain how $90 \%$ is used as a measure of reliability for the interval.

Solution

VerifiedGiven:

$\begin{aligned} n&=\text{Sample size}=766 \\ x&=\text{Number of successes}=628 \\ c&=\text{Confidence coefficient}=90\%=0.90 \end{aligned}$

We need to determine a confidence interval about the population proportion $p$.

The confidence interval about the population proportion is $\hat{p}\pm E$ with $E=z_{\alpha/2}\cdot \sqrt{\dfrac{\hat{p}\hat{q}}{n}}$.

## Create a free account to view solutions

## Create a free account to view solutions

## Recommended textbook solutions

#### Statistics for Business and Economics

13th Edition•ISBN: 9780134446332 (1 more)James T. McClave, P. George Benson, Terry T Sincich#### Statistics for Business and Economics

12th Edition•ISBN: 9781133274537 (12 more)David R. Anderson, Dennis J. Sweeney, James J Cochran, Jeffrey D. Camm, Thomas A. Williams#### Essentials of Modern Business Statistics with Microsoft Office Excel

7th Edition•ISBN: 9781337298292David Anderson, Dennis J. Sweeney, James J Cochran, Jeffrey D. Camm, Thomas A. Williams#### Statistics for Business and Economics

14th Edition•ISBN: 9781337901062 (1 more)David R. Anderson, Dennis J. Sweeney, James J Cochran, Jeffrey D. Camm, Thomas A. Williams## More related questions

1/4

1/7