A Criminal Justice researcher knows the average number of prior felony convictio

Question

A Criminal Justice researcher knows the average number of prior felony convictions for all those incarcerated In the United States is 1.50. She is interested in determining if those currently incarcerated in Riker's Island have a statistically different average number of felony convictions when compared to the United States average. Open the Riker's Island data file and using the variable "pfel" conduct the proper test to answer this question. Use an alpha level of .01 for this test. 1. What is the calculated value for the test? 2. What is the average amount of prior felony convictions for those in Riker's Island? What is the average amount of prior felony convictions for all in the United States? What is the difference between these two means? 3. Is there a real/statistically significant difference in the average amount of prior felonies between those incarcerated in Riker's Island compared to all those incarcerated in the United States ?Do you accept or reject the Null?

Explanation / Answer

Q-1

Calculated value for the test statistic =20.834

Q-2

Average for hose in Rikers’s is =0.58

Average for all in United states=1.50

Q-3

As p-value=0.000<0.01, we reject the null hypothesis and conclude that there is statistically significan difference in the average amount.

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