The table below shows the estimated vaccination coverage of adolescents aged 13-17 years, as reported in national surveys in 2020 and 2021. Vaccine Percent vaccinated (95% CI) Tdap (tetanus, diphtheria, and acellular pertussis vaccine) 2020: 90.1 (89.2–90.9) 2021: 89.6 (88.6–90.5) MMR (measles, mumps, and rubella vaccine) 2020: 92.4 (91.6–93.2) 2021: 92.2 (91.2–93.2) HPV (human papillomavirus vaccine) 2020: 58.6 (57.3–60.0) 2021: 61.7 (60.2–63.2) Answer these: a. For which vaccine(s) was there a statistically significant change in coverage from 2020 to 2021? For each, note whether it was a statistically significant increase or decrease? b. For which vaccine(s) was there no significant change in coverage from 2020 to 2021?

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