TOPIC 9 - RELATIONSHIPS WITH CATEGORICAL VARIABLES

9-1: Penny Thoughts ( cont. )

(a)

Category pair	Tally
Retain, liberal	ANSWER IS DEPENDENT ON CLASS
Retain, moderate
Retain, conservative
Abolish, liberal
Abolish, moderate
Abolish, conservative

(b)

	Retain	Abolish
Liberal	ANSWER IS DEPENDENT ON CLASS
Moderate
Conservative

9-2: Age and Political Ideology

(a) 0.205

(b) 0.388

(c) 0.406

(d) 0.280

(e) 0.473

(f) 0.247

(g)

Series 1 - Liberal
Series 2 - Moderate
Series 3 - Conservative

(h) (Asks for interpretation)

(i) 0.473

(j) 0.199

(k) 0.097

9-3: Pregnancy, AZT, and HIV

(a) (Asks for prediction)

(b) AZT: 0.079; HIV: 0.250

(c) 3.23

(d) (Asks for interpretation)

9-4: Hypothetical Hospital Recovery Rates

(a) A: 0.8; B: 0.7; B saves the higher percentage.

(b) Are you convinced?

(c) A: 0.983; B: 0.967; A saves the higher percentage.

(d) A: 0.525; B: 0.3; A saves the higher percentage.

(e) Hospital A tends to treat the large majority of patients in "poor" condition. Since these patients are more likely to die than those in "good" condition, A's overall survival rate is lower than B's despite being higher for each type of patient.

(f) Hospital A is preferable regardless of one's condition.

9-5: Hypothetical Employee Retention Predictions

(a) 0.16

(b) 0.16

(c) no

(d) no

(e)

Series 1 - Predicted to stay
Series 2 - Predicted to leave

(f)

Series 1 - Predicted to stay
Series 2 - Predicted to leave