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[answered] Module 6 Homework Assignment An investigator analyzed the l


Wondering if someone can help with my stats homework for this module?

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Name: Module 6 Homework Assignment

 

An investigator analyzed the leading digits of the amounts from 200 checks issued by three suspect

 

companies. The frequencies were found to be 68, 40, 18, 19, 8, 20, 6, 9, 12 and those digits correspond

 

to the leading digits of 1, 2, 3, 4, 5, 6, 7, 8, and 9, respectively. If the observed frequencies are

 

substantially different from the frequencies expected with Benford's law, the check amounts appear to

 

be the result of fraud. Use a 0.05 significance level to test for goodness-of-fit with Benford's law.

 

1. Calculate the ?2 test statistic.

 

Solution: Instructor Comments: 2. Calculate the ?2 critical value.

 

Solution: Instructor Comments: 3. Is there sufficient evidence to conclude that the checks are the result of fraud?

 

Solution: Instructor Comments: Alert nurses at the Veteran's Affairs Medical Center in Northampton, Massachusetts, noticed an

 

unusually high number of deaths at times when another nurse, Kristen Gilbert, was working. Kristen

 

Gilbert was arrested and charged with four counts of murder and two counts of attempted murder.

 

When seeking a grand jury indictment, prosecutors provided a key piece of evidence consisting of the

 

table below. Use a 0.01 significance level to test the defense claim that deaths on shifts are independent

 

of whether Gilbert was working. Gilbert Was Working Shifts With a Death

 

40 Shifts Without a Death

 

217 Gilbert Was Not Working 34 1350 4. Calculate the ?2 test statistic.

 

Solution: Instructor Comments: 5. Calculate the ?2 critical value.

 

Solution: Instructor Comments: 6. Is there sufficient evidence to reject the defense claim that deaths on shifts are independent of

 

whether Gilbert was working?

 

Solution:

 

Instructor Comments:

 


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