You work in the security department of a bank’s website. To access their accounts, customers of the bank must create an 8-digit password. It is your job to determine the password requirements for these accounts. Security guidelines state that for the website to be secure, the probability that an 8-digit password is guessed on one try must be less than 1 60 8 , assuming all passwords are equally likely. Your job is to use the probability techniques you have learned in this chapter to decide what requirements a customer must meet when choosing a password, including what sets of characters are allowed, so that the website is secure according to the security guidelines. 1. How Would You Do It? (a) How would you investigate the question of what password requirements you should set to meet the security guidelines? (b) What statistical methods taught in this chapter would you use?
You work in the security department of a bank’s website. To access their accounts, customers of the bank must create an 8-digit password. It is your job to determine the password requirements for these accounts. Security guidelines state that for the website to be secure, the probability that an 8-digit password is guessed on one try must be less than 1 60 8 , assuming all passwords are equally likely. Your job is to use the probability techniques you have learned in this chapter to decide what requirements a customer must meet when choosing a password, including what sets of characters are allowed, so that the website is secure according to the security guidelines. 1. How Would You Do It? (a) How would you investigate the question of what password requirements you should set to meet the security guidelines? (b) What statistical methods taught in this chapter would you use?
Solution Summary: The author explains how the probability of guessing an 8-digit password in one attempt must be less than 1608.
You work in the security department of a bank’s website. To access their accounts, customers of the bank must create an 8-digit password. It is your job to determine the password requirements for these accounts. Security guidelines state that for the website to be secure, the probability that an 8-digit password is guessed on one try must be less than
1
60
8
, assuming all passwords are equally likely.
Your job is to use the probability techniques you have learned in this chapter to decide what requirements a customer must meet when choosing a password, including what sets of characters are allowed, so that the website is secure according to the security guidelines.
1. How Would You Do It?
(a) How would you investigate the question of what password requirements you should set to meet the security guidelines?
(b) What statistical methods taught in this chapter would you use?
7.1. If X has an exponential distribution with the
parameter 0, use the distribution function technique
to find the probability density of the random variable
Y = ln X.
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3. Please
What does the margin of error include? When a margin of error is reported for a survey, it includes
a. random sampling error and other practical difficulties like undercoverage and non-response
b. random sampling error, but not other practical difficulties like undercoverage and nonresponse
c. practical difficulties like undercoverage and nonresponse, but not random smapling error
d. none of the above is corret
Chapter 3 Solutions
Elementary Statistics Plus MyLab Statistics with Pearson eText -- Access Card Package (7th Edition) (What's New in Statistics)
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Discrete Distributions: Binomial, Poisson and Hypergeometric | Statistics for Data Science; Author: Dr. Bharatendra Rai;https://www.youtube.com/watch?v=lHhyy4JMigg;License: Standard Youtube License