Items 1 and 2 relate to the following SPSS output. A researcher is interested in characteristics of HIV+ and HIV- adolescents interviewed 166 young adults about their experiences during adolescence. He wished to know, among other things, if there were significant differences in the ages at which HIV+ and HIV- young adults became sexually active. The following is the printout of this analysis:

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HIV Status                              N         Mean               sd                    Stnd. Error                 

Age at             Positive           57        13.2                 2.96576           .39282

first sexual

experience       Negative          109      15.1                 2.57286           .24644

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Independent Samples Test

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                                                                        Levene's Test for

                                                                        Equality of Variances

                                                                        F                      Sig      

Age at             Equal variance assumed          1.313               .254

first sexual

experience       Equal variance not assumed

                                                            t-test for Equality of Means

                                                                        t           df        sig.       mean difference         

Age at             Equal variance assumed          -2.870  164      .005                 -1.9

first sexual

experience       Equal variance not assumed    -2.745  99.66   .007                 -1.9

1. Were there significant differences between the groups. Give the relevant stastical data to support your answer?

2. What is the confidence interval associated with your answer to item # 1?