Question

Sex of offender Sex of Victim Male Female 3,760 450 Female 1.590 140 Source: US Department of Justice, Expanded Homicide Data, Table 6, 2011 Treating sex of offender as the independent variable, how many errors of prediction will be made if the independent variable is ignored? b. How many fewer errors will be made if the independent variable is taken into account? Combine your answers in (a) and (b) to calculate lambda. Discuss the relationship between these two variables. 4. Which lambda is stronger, the one for sex of offenders/victims or rice of offenders victims (Exercise 5)? Earlier in this chapter, we reviewed Inman and Mayes' (1999) research on first-generation college students. They also examined the relationship between student race and first- pelication college status. Based on their data, test whether race is independent of first generation college status (alpha = .01). Student Race First- Generation College Status Native American Total White Black Asian American 6 1.910 Hispanic 19 25 102 119 1.742 2,300 41 45 Nontists 2.603 22 2,392

question a, b, c, d

Answer 1

Soution FYom Given informabion, ser of Victim Male temale Total Male 10 3,760 450 Femalb T730 140 1,590 Total 590 S,350 incpendent Vcuiable tha modal fagueney of the vicbm vaniable sex of affencor as dependent Vaoa le wi be biage 5350 Vs 590 (cohich one is apunay) enmadal aguah beomes modal cohera, el - no. of eoors n pcickion cohen tho nbpendent Vacia ble is ignored n total faguenu 53 50+ 590 S940 ubstitelte to vlues n above 5940 - 5350 el

b) number of Eaors in pedicton ahan the indpencknt vetia ble takan into accaurt ea ealteaa Ccohera e2l 42lo-3160 EGrom You 450 esa- totl ro- modal foguny af Ya2 F1730 -1590 = 40 Substibule tose values mabeve apaion 50 t 40 Ca 9 calulahron of lambda and elationship Leluan thabe to Veaables (e1-ee) lambda el hare, e5q0, ea- 390 590-590 lambda-

lambda from o to nga 3, tis close to o tan t 2laonskip 3 ceeak, and Close to indicates t aktonship is strong Thae is no ulationsh betuen to veaiables set of offendar and sex of vichim d) lambda if sex of calulate ల inchpendnt vaabie at aso beo. Offerder as t Hence both in tair individual choices as any inckpencent Variable docsnt resul in Yeduchion of Eors