Task 3: A health psychologist interested in research into HIV wanted to know the factors that influenced condom use with a new partner

(relationship less than 1 month old). The outcome measure was whether a condom was used (use: condom used = 1, not used = 0). The predictor variables were mainly scales from the Condom Attitude Scale (CAS) by Sacco, Levine, Reed, and Thompson (1991): gender

(gender of the person); safety (relationship safety, measured out of 5, indicates the degree to which the person views this relationship as

‘safe’ from sexually transmitted disease); sexexp (sexual experience, measured out of 10, indicates the degree to which previous experience influences attitudes towards condom use); previous (a measure not from the CAS, this variable measures whether or not the couple used a condom in their previous encounter: 1 = condom used, 0 = not used, 2

= no previous encounter with this partner); selfcon (self-control, measured out of 9, indicates the degree of self-control that a person has when it comes to condom use, i.e., whether they get carried away with the heat of the moment, or exert control); perceive (perceived risk, measured out of 6, indicates the degree to which the person feels at risk from unprotected sex). Previous research (Sacco, Rickman, Thompson, Levine, & Reed, 1993) has shown that gender, relationship safety and perceived risk predict condom use. Carry out an appropriate analysis to verify these previous findings, and to test whether selfcontrol, previous usage and sexual experience can predict any of the remaining variance in condom use. (1) Interpret all important parts of the R output. (2) How reliable is the final model? (3) What are the probabilities that participants 12, 53 and 75 will use a condom? (4) A female who used a condom in her previous encounter with her new partner scores 2 on all variables except perceived risk (for which she scores 6). Use the model to estimate the probability that she will use a condom in her next encounter. Data are in the file condom.dat.