A Criminal Justice researcher knows the average number of prior felony convictio
ID: 3219093 • Letter: A
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. Explain why you conducted the certain t test What is the research question? What is the Null & Research Hypothesis for this test? State in both symbols and words What is the calculated value for the test?Explanation / Answer
1. In this case, we need to conduct the t-test as the researcher wants to compare the difference in mean/average for felony convictions between two group (United states vs Riker's island. The independent samples t-test is used when two separate sets of independent and identically distributed samples are obtained, one from each of the two populations being compared.
2. Research question: Does Riker's island has a statistically significant different average number of felony convictions as compared to United states?
3, Null hypothesis: There is no difference in an average number of felony convictions between Riker"s island and United states.
H0 average number of felony convictions in Riker"s island = average number of felony convictions in United states.
Researcher/Alternate hypothesis: There is a statistically significant difference in the average number of felony convictions between Riker"s island and United states.
Ha : an average number of felony convictions in Riker"s island average number of felony convictions in United states.
4. Since alpha level is 0.01, confidence level 99%, the calculated or critical value for z = 2.33
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