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:

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

Independent Samples Test
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?

Each of the questions on the following pages is a calculation problem worth 10 points. Partial credit will be awarded if I can following your procedures and determine that errors are arithmetic rather than conceptual. It would be wise, therefore, to clearly indicate your worksteps on each problem.

3. For the following data set, calculate the oneway ANOVA and test for significance at the .05 level.

Group 1                       Group 2                       Group 3                       Group 4

x          x²                     x          x²                     x          x²                     x          x²

7          49                    10        100                  12        144                  16        256

8          64                    12        144                  14        196                  15        225

7          49                    13        169                  13        169                  18        324

9          81                    13        169                  11        121                  17        289

9          81                    14        196                  13        169                  20        400

11        121                  15        225                  15        225                  21        441

10        100                  14        196                  13        169                  22        484

61        545                  91     1,199                  91     1,193                 129     2,419

Posted Date: 2/18/2013 12:59:46 AM | Location : United States

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