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Chapter 11: Q11-4BSC (page 533)

Cybersecurity What do the results from the preceding exercises suggest about the possibility that the computer has been hacked? Is there any corrective action that should be taken?

Short Answer

Expert verified

Yes, there is a possibility that the computer has been hacked and there is a need for corrective action to be taken.

Step by step solution

01

Given information

The expected frequencies of the leading digits of inter-arrival traffic times are tabulated using Benford鈥檚 Law whereas the observed frequencies are obtained using a computer.

02

Necessary action

Referring to Exercise 3 of section 11-1,it has been concluded that the leading digits do not have a distribution that fits well with Benford鈥檚 law.

This means that the computer is not generating accurate results.

This implies that the computer might have been hacked.

If the computer has been jacked, corrective action is necessary to improve its performance in the future.

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Most popular questions from this chapter

Probability Refer to the results from the 150 subjects in Cumulative Review Exercise 5.

a.Find the probability that if 1 of the 150 subjects is randomly selected, the result is a woman who spent the money.

b.Find the probability that if 1 of the 150 subjects is randomly selected, the result is a woman who spent the money or was given a single 100-yuan bill.

c.If two different women are randomly selected, find the probability that they both spent the money.

Questions 6鈥�10 refer to the sample data in the following table, which describes the fate of the passengers and crew aboard the Titanic when it sank on April 15, 1912. Assume that the data are a sample from a large population and we want to use a 0.05 significance level to test the claim that surviving is independent of whether the person is a man, woman, boy, or girl.


Men

Women

Boys

Girls

Survived

332

318

29

27

Died

1360

104

35

18

Given that the P-value for the hypothesis test is 0.000 when rounded to three decimal places, what do you conclude? What do the results indicate about the rule that women and children should be the first to be saved?

Is the hypothesis test described in Exercise 1 right tailed, left-tailed, or two-tailed? Explain your choice.

A study of people who refused to answer survey questions provided the randomly selected sample data shown in the table below (based on data from 鈥淚 Hear You Knocking But You Can鈥檛 Come In,鈥� by Fitzgerald and Fuller, Sociological Methods and Research,Vol. 11, No. 1). At the 0.01 significance level, test the claim that the cooperation of

the subject (response or refusal) is independent of the age category. Does any particular age group appear to be particularly uncooperative?

Age


18-21

22-29

30-39

40-49

50-59

60 and over

Responded

73

255

245

136

138

202

Refused

11

20

33

16

27

49

In a study of high school students at least 16 years of age, researchers obtained survey results summarized in the accompanying table (based on data from 鈥淭exting While Driving and Other Risky Motor Vehicle Behaviors Among U.S. High School Students,鈥� by O鈥橫alley, Shults, and Eaton, Pediatrics,Vol. 131, No. 6). Use a 0.05 significance level to

test the claim of independence between texting while driving and driving when drinking alcohol. Are those two risky behaviors independent of each other?


Drove when drinking Alcohol?


Yes

No

Texted while driving

731

3054

No Texting while driving

156

4564
See all solutions

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