1) finding a job through networking. Among 703 randomly selected workers, 61% got their jobs through networking.

A) use the sample data with .05 significance level to test and t decide if a claim i true hat more than 50% workers get their jobs through networking.

B) discuss what type of error might have been made. if there was an error, what do you do to minimize this type of error?

2)"most teens are not careful enough about the information they give out about themselves online." in a a survey that randomly sampled 971 teenagers who have online access, 78% agreed with this statement.

A)compute the 90% confidence interval for the population of teenagers who would agree with this statement.

B) find the margin error.

C)Interpret this confidence interval obtained in part(a)

D)what is the meaning of 91% confidence (or capture rate)?

E)For 95% confidence, would you need a wider or narrower interval? why? show your reasoning.

3) some sociologists say that the reason for the decline in crime rates in the 1980s and 1900d is demographics. It seems that the population is aging, and older people commit fewer crimes. according to the FBI and the Justice Department approximately 68% of all arrests are of males aged 15 and 34. Suppose that you are a sociologist in Rock Springs, Wyoming and a random sample of police files showed that 32 arrests last month, 24 were of males aged 15 to 34 years.

A) Use a 1% level of significance to test and to decide if the claim is true that the population of such arrests is Rock Springs, is different from 68%.

B) Discuss what type of error might have been made. If there was an error, what do you do t minimize this type of error?

Subject | Mathematics |

Due By (Pacific Time) | 11/18/2014 12:00 pm |

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