Concept explainers
Stop the study (ExH). A 2006 NIH study of circumcision and HIV-AIDS in Kenya was stopped early because it became so evident that circumcisions reduced the probability of contracting AIDS. Uncircumcised men without AIDS were randomly divided into two groups. Both received safe sex educat ion and condoms, and one group had circumcisions performed by a physic ian in a hospital. After one year, 22 of the 1,393 circumcised men had AIDS, compared to 47 of the 1391 uncircumcised men.
Make a table and compute the rate of AIDS in the two groups. Explain what it means that this difference is statistically significant. Do you think it is also practically significant?
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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